21211220986 has 16 divisors (see below), whose sum is σ = 31958819424. Its totient is φ = 10558378224.

The previous prime is 21211220981. The next prime is 21211220993. The reversal of 21211220986 is 68902211212.

It is not an unprimeable number, because it can be changed into a prime (21211220981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422476 + ... + 470008.

It is an arithmetic number, because the mean of its divisors is an integer number (1997426214).

Almost surely, 2^21211220986 is an apocalyptic number.

21211220986 is a deficient number, since it is larger than the sum of its proper divisors (10747598438).

21211220986 is a wasteful number, since it uses less digits than its factorization.

21211220986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48525.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 21211220986 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, nine hundred eighty-six".