21278358029757 has 16 divisors (see below), whose sum is σ = 29138873984640. Its totient is φ = 13801731844032.

The previous prime is 21278358029743. The next prime is 21278358029777. The reversal of 21278358029757 is 75792085387212.

It is not a de Polignac number, because 21278358029757 - 2⁴ = 21278358029741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21278358029777) 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 15 ways as a sum of consecutive naturals, for example, 365743 + ... + 6533795.

It is an arithmetic number, because the mean of its divisors is an integer number (1821179624040).

Almost surely, 2^{21278358029757} is an apocalyptic number.

It is an amenable number.

21278358029757 is a deficient number, since it is larger than the sum of its proper divisors (7860515954883).

21278358029757 is a wasteful number, since it uses less digits than its factorization.

21278358029757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6199172.

The product of its (nonzero) digits is 118540800, while the sum is 66.

The spelling of 21278358029757 in words is "twenty-one trillion, two hundred seventy-eight billion, three hundred fifty-eight million, twenty-nine thousand, seven hundred fifty-seven".