1243141220251 has 8 divisors (see below), whose sum is σ = 1422687069440. Its totient is φ = 1064083932648.

The previous prime is 1243141220249. The next prime is 1243141220273. The reversal of 1243141220251 is 1520221413421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1243141220251 - 2¹ = 1243141220249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243141220201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122134941 + ... + 122145118.

It is an arithmetic number, because the mean of its divisors is an integer number (177835883680).

Almost surely, 2^{1243141220251} is an apocalyptic number.

1243141220251 is a deficient number, since it is larger than the sum of its proper divisors (179545849189).

1243141220251 is an equidigital number, since it uses as much as digits as its factorization.

1243141220251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244280793.

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 1243141220251 its reverse (1520221413421), we get a palindrome (2763362633672).

The spelling of 1243141220251 in words is "one trillion, two hundred forty-three billion, one hundred forty-one million, two hundred twenty thousand, two hundred fifty-one".