21213611545986 has 32 divisors (see below), whose sum is σ = 49190983297920. Its totient is φ = 6763760202672.

The previous prime is 21213611545967. The next prime is 21213611545993. The reversal of 21213611545986 is 68954511631212.

21213611545986 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 3 + 6 + 1 + 1 + 545 + 98 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8540100025 + ... + 8540102508.

It is an arithmetic number, because the mean of its divisors is an integer number (1537218228060).

Almost surely, 2^{21213611545986} is an apocalyptic number.

21213611545986 is an abundant number, since it is smaller than the sum of its proper divisors (27977371751934).

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

21213611545986 is a wasteful number, since it uses less digits than its factorization.

21213611545986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080202567 (or 17080202561 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 21213611545986 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred forty-five thousand, nine hundred eighty-six".