21011577370 has 32 divisors (see below), whose sum is σ = 43956432000. Its totient is φ = 7081866816.

The previous prime is 21011577359. The next prime is 21011577463. The reversal of 21011577370 is 7377511012.

It is a happy number.

It is a super-2 number, since 2×21011577370² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2539645 + ... + 2547904.

It is an arithmetic number, because the mean of its divisors is an integer number (1373638500).

Almost surely, 2^21011577370 is an apocalyptic number.

21011577370 is an abundant number, since it is smaller than the sum of its proper divisors (22944854630).

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

21011577370 is a wasteful number, since it uses less digits than its factorization.

21011577370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5087622.

The product of its (nonzero) digits is 10290, while the sum is 34.

The spelling of 21011577370 in words is "twenty-one billion, eleven million, five hundred seventy-seven thousand, three hundred seventy".