21201120220985 has 32 divisors (see below), whose sum is σ = 27491802340608. Its totient is φ = 15656422129920.

The previous prime is 21201120220979. The next prime is 21201120221023. The reversal of 21201120220985 is 58902202110212.

It is a happy number.

It is not a de Polignac number, because 21201120220985 - 2²⁶ = 21201053112121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28140047 + ... + 28883636.

It is an arithmetic number, because the mean of its divisors is an integer number (859118823144).

Almost surely, 2^{21201120220985} is an apocalyptic number.

It is an amenable number.

21201120220985 is a deficient number, since it is larger than the sum of its proper divisors (6290682119623).

21201120220985 is a wasteful number, since it uses less digits than its factorization.

21201120220985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57023825.

The product of its (nonzero) digits is 11520, while the sum is 35.

The spelling of 21201120220985 in words is "twenty-one trillion, two hundred one billion, one hundred twenty million, two hundred twenty thousand, nine hundred eighty-five".