21264035256129 has 16 divisors (see below), whose sum is σ = 28659707781120. Its totient is φ = 14023022393040.

The previous prime is 21264035256119. The next prime is 21264035256133. The reversal of 21264035256129 is 92165253046212.

It is not a de Polignac number, because 21264035256129 - 2⁵ = 21264035256097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21264035256119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103556677 + ... + 103761810.

It is an arithmetic number, because the mean of its divisors is an integer number (1791231736320).

Almost surely, 2^{21264035256129} is an apocalyptic number.

It is an amenable number.

21264035256129 is a deficient number, since it is larger than the sum of its proper divisors (7395672524991).

21264035256129 is a wasteful number, since it uses less digits than its factorization.

21264035256129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207318860.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 21264035256129 in words is "twenty-one trillion, two hundred sixty-four billion, thirty-five million, two hundred fifty-six thousand, one hundred twenty-nine".