21151012611016 has 16 divisors (see below), whose sum is σ = 40308282230940. Its totient is φ = 10402137349440.

The previous prime is 21151012610993. The next prime is 21151012611101. The reversal of 21151012611016 is 61011621015112.

It can be written as a sum of positive squares in 2 ways, for example, as 20384592904900 + 766419706116 = 4514930^2 + 875454^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21671118991 + ... + 21671119966.

Almost surely, 2^{21151012611016} is an apocalyptic number.

It is an amenable number.

21151012611016 is a deficient number, since it is larger than the sum of its proper divisors (19157269619924).

21151012611016 is a wasteful number, since it uses less digits than its factorization.

21151012611016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43342239024 (or 43342239020 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 28.

Adding to 21151012611016 its reverse (61011621015112), we get a palindrome (82162633626128).

The spelling of 21151012611016 in words is "twenty-one trillion, one hundred fifty-one billion, twelve million, six hundred eleven thousand, sixteen".