201021020220156 has 12 divisors (see below), whose sum is σ = 469049047180392. Its totient is φ = 67007006740048.

The previous prime is 201021020220127. The next prime is 201021020220157. The reversal of 201021020220156 is 651022020120102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021020220157) 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, 8375875842495 + ... + 8375875842518.

It is an arithmetic number, because the mean of its divisors is an integer number (39087420598366).

Almost surely, 2^{201021020220156} is an apocalyptic number.

It is an amenable number.

201021020220156 is an abundant number, since it is smaller than the sum of its proper divisors (268028026960236).

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

201021020220156 is a wasteful number, since it uses less digits than its factorization.

201021020220156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16751751685020 (or 16751751685018 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 201021020220156 its reverse (651022020120102), we get a palindrome (852043040340258).

The spelling of 201021020220156 in words is "two hundred one trillion, twenty-one billion, twenty million, two hundred twenty thousand, one hundred fifty-six".