21617071612 has 12 divisors (see below), whose sum is σ = 38204429256. Its totient is φ = 10701520400.

The previous prime is 21617071607. The next prime is 21617071631.

21617071612 is nontrivially palindromic in base 10.

It is a congruent number.

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, 26753398 + ... + 26754205.

It is an arithmetic number, because the mean of its divisors is an integer number (3183702438).

Almost surely, 2^21617071612 is an apocalyptic number.

It is an amenable number.

21617071612 is a deficient number, since it is larger than the sum of its proper divisors (16587357644).

21617071612 is a wasteful number, since it uses less digits than its factorization.

21617071612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53507708 (or 53507706 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 34.

It can be divided in two parts, 216170 and 71612, that added together give a palindrome (287782).

The spelling of 21617071612 in words is "twenty-one billion, six hundred seventeen million, seventy-one thousand, six hundred twelve".