21202102111985 has 16 divisors (see below), whose sum is σ = 25874999769600. Its totient is φ = 16673391267456.

The previous prime is 21202102111979. The next prime is 21202102112041. The reversal of 21202102111985 is 58911120120212.

It is a cyclic number.

It is not a de Polignac number, because 21202102111985 - 2⁴ = 21202102111969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4429856 + ... + 7875774.

It is an arithmetic number, because the mean of its divisors is an integer number (1617187485600).

Almost surely, 2^{21202102111985} is an apocalyptic number.

It is an amenable number.

21202102111985 is a deficient number, since it is larger than the sum of its proper divisors (4672897657615).

21202102111985 is a wasteful number, since it uses less digits than its factorization.

21202102111985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466840.

The product of its (nonzero) digits is 5760, while the sum is 35.

The spelling of 21202102111985 in words is "twenty-one trillion, two hundred two billion, one hundred two million, one hundred eleven thousand, nine hundred eighty-five".