202121010128 has 40 divisors (see below), whose sum is σ = 423467574912. Its totient is φ = 93092023808.

The previous prime is 202121010127. The next prime is 202121010181. The reversal of 202121010128 is 821010121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121010127) 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, 7892450 + ... + 7918017.

Almost surely, 2^202121010128 is an apocalyptic number.

It is an amenable number.

202121010128 is an abundant number, since it is smaller than the sum of its proper divisors (221346564784).

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

202121010128 is a wasteful number, since it uses less digits than its factorization.

202121010128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15810539 (or 15810533 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 202121010128 in words is "two hundred two billion, one hundred twenty-one million, ten thousand, one hundred twenty-eight".