252021421 has 4 divisors (see below), whose sum is σ = 253103292. Its totient is φ = 250939552.

The previous prime is 252021403. The next prime is 252021457. The reversal of 252021421 is 124120252.

252021421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172633321 + 79388100 = 13139^2 + 8910^2 .

It is a cyclic number.

It is not a de Polignac number, because 252021421 - 2⁷ = 252021293 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 (252021401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540586 + ... + 541051.

It is an arithmetic number, because the mean of its divisors is an integer number (63275823).

Almost surely, 2^252021421 is an apocalyptic number.

It is an amenable number.

252021421 is a deficient number, since it is larger than the sum of its proper divisors (1081871).

252021421 is a wasteful number, since it uses less digits than its factorization.

252021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081870.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 252021421 is about 15875.1825501315. The cubic root of 252021421 is about 631.6538564462.

Adding to 252021421 its reverse (124120252), we get a palindrome (376141673).

The spelling of 252021421 in words is "two hundred fifty-two million, twenty-one thousand, four hundred twenty-one".