1650121421 has 4 divisors (see below), whose sum is σ = 1777053852. Its totient is φ = 1523188992.

The previous prime is 1650121411. The next prime is 1650121441. The reversal of 1650121421 is 1241210561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241210561 = 199 ⋅6237239.

It can be written as a sum of positive squares in 2 ways, for example, as 647702500 + 1002418921 = 25450^2 + 31661^2 .

It is not a de Polignac number, because 1650121421 - 2⁶ = 1650121357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650121411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63466196 + ... + 63466221.

It is an arithmetic number, because the mean of its divisors is an integer number (444263463).

Almost surely, 2^1650121421 is an apocalyptic number.

It is an amenable number.

1650121421 is a deficient number, since it is larger than the sum of its proper divisors (126932431).

1650121421 is a wasteful number, since it uses less digits than its factorization.

1650121421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126932430.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1650121421 is about 40621.6865848773. The cubic root of 1650121421 is about 1181.6947354206.

Adding to 1650121421 its reverse (1241210561), we get a palindrome (2891331982).

The spelling of 1650121421 in words is "one billion, six hundred fifty million, one hundred twenty-one thousand, four hundred twenty-one".