21213611545996 has 12 divisors (see below), whose sum is σ = 37133430333552. Its totient is φ = 10604060022128.

The previous prime is 21213611545993. The next prime is 21213611546011. The reversal of 21213611545996 is 69954511631212.

It is not an unprimeable number, because it can be changed into a prime (21213611545993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686420335 + ... + 686451238.

It is an arithmetic number, because the mean of its divisors is an integer number (3094452527796).

Almost surely, 2^{21213611545996} is an apocalyptic number.

It is an amenable number.

21213611545996 is a deficient number, since it is larger than the sum of its proper divisors (15919818787556).

21213611545996 is a wasteful number, since it uses less digits than its factorization.

21213611545996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372875440 (or 1372875438 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 55.

The spelling of 21213611545996 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred forty-five thousand, nine hundred ninety-six".