21131622446518 has 16 divisors (see below), whose sum is σ = 31735290936384. Its totient is φ = 10553194375360.

The previous prime is 21131622446509. The next prime is 21131622446549. The reversal of 21131622446518 is 81564422613112.

It is a congruent 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, 18498096 + ... + 19607212.

It is an arithmetic number, because the mean of its divisors is an integer number (1983455683524).

Almost surely, 2^{21131622446518} is an apocalyptic number.

21131622446518 is a deficient number, since it is larger than the sum of its proper divisors (10603668489866).

21131622446518 is a wasteful number, since it uses less digits than its factorization.

21131622446518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120487.

The product of its digits is 552960, while the sum is 46.

The spelling of 21131622446518 in words is "twenty-one trillion, one hundred thirty-one billion, six hundred twenty-two million, four hundred forty-six thousand, five hundred eighteen".