21151012611020 has 24 divisors (see below), whose sum is σ = 44418046546944. Its totient is φ = 8460229794176.

The previous prime is 21151012610993. The next prime is 21151012611101. The reversal of 21151012611020 is 2011621015112.

It is a happy 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, 9961289 + ... + 11896608.

It is an arithmetic number, because the mean of its divisors is an integer number (1850751939456).

Almost surely, 2^{21151012611020} is an apocalyptic number.

21151012611020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21151012611020 is an abundant number, since it is smaller than the sum of its proper divisors (23267033935924).

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

21151012611020 is a wasteful number, since it uses less digits than its factorization.

21151012611020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21906289 (or 21906287 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 23.

Adding to 21151012611020 its reverse (2011621015112), we get a palindrome (23162633626132).

The spelling of 21151012611020 in words is "twenty-one trillion, one hundred fifty-one billion, twelve million, six hundred eleven thousand, twenty".