21101427255792 has 80 divisors (see below), whose sum is σ = 58798289113088. Its totient is φ = 6482457112320.

The previous prime is 21101427255791. The next prime is 21101427255803. The reversal of 21101427255792 is 29755272410112.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101427255791) 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, 26402128 + ... + 27189615.

Almost surely, 2^{21101427255792} is an apocalyptic number.

It is an amenable number.

21101427255792 is an abundant number, since it is smaller than the sum of its proper divisors (37696861857296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21101427255792 is a wasteful number, since it uses less digits than its factorization.

21101427255792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53592398 (or 53592392 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 48.

The spelling of 21101427255792 in words is "twenty-one trillion, one hundred one billion, four hundred twenty-seven million, two hundred fifty-five thousand, seven hundred ninety-two".