21091614912 has 84 divisors (see below), whose sum is σ = 61929894936. Its totient is φ = 6859054080.

The previous prime is 21091614889. The next prime is 21091614923. The reversal of 21091614912 is 21941619012.

It is a happy number.

21091614912 is a `hidden beast` number, since 2 + 1 + 0 + 9 + 161 + 491 + 2 = 666.

It is a super-2 number, since 2×21091614912² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 422938 + ... + 470169.

It is an arithmetic number, because the mean of its divisors is an integer number (737260654).

Almost surely, 2^21091614912 is an apocalyptic number.

It is an amenable number.

21091614912 is an abundant number, since it is smaller than the sum of its proper divisors (40838280024).

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

21091614912 is a wasteful number, since it uses less digits than its factorization.

21091614912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893166 (or 893153 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The spelling of 21091614912 in words is "twenty-one billion, ninety-one million, six hundred fourteen thousand, nine hundred twelve".