21243076957502 has 16 divisors (see below), whose sum is σ = 33744912610752. Its totient is φ = 9994991569920.

The previous prime is 21243076957493. The next prime is 21243076957507. The reversal of 21243076957502 is 20575967034212.

It is a super-2 number, since 2×21243076957502² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243076957507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54506963 + ... + 54895310.

It is an arithmetic number, because the mean of its divisors is an integer number (2109057038172).

Almost surely, 2^{21243076957502} is an apocalyptic number.

21243076957502 is a deficient number, since it is larger than the sum of its proper divisors (12501835653250).

21243076957502 is a wasteful number, since it uses less digits than its factorization.

21243076957502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109408003.

The product of its (nonzero) digits is 6350400, while the sum is 53.

It can be divided in two parts, 2124307 and 6957502, that added together give a palindrome (9081809).

The spelling of 21243076957502 in words is "twenty-one trillion, two hundred forty-three billion, seventy-six million, nine hundred fifty-seven thousand, five hundred two".