21077880126 has 16 divisors (see below), whose sum is σ = 42268782864. Its totient is φ = 7007122944.

The previous prime is 21077880119. The next prime is 21077880157. The reversal of 21077880126 is 62108877012.

It is a super-3 number, since 3×21077880126³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4706851 + ... + 4711326.

It is an arithmetic number, because the mean of its divisors is an integer number (2641798929).

Almost surely, 2^21077880126 is an apocalyptic number.

21077880126 is an abundant number, since it is smaller than the sum of its proper divisors (21190902738).

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

21077880126 is a wasteful number, since it uses less digits than its factorization.

21077880126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9418555.

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 21077880126 in words is "twenty-one billion, seventy-seven million, eight hundred eighty thousand, one hundred twenty-six".