202122091602 has 18 divisors (see below), whose sum is σ = 437935331223. Its totient is φ = 67373394732.

The previous prime is 202122091541. The next prime is 202122091607. The reversal of 202122091602 is 206190221202.

It is a happy number.

202122091602 is a `hidden beast` number, since 20 + 2 + 12 + 20 + 9 + 1 + 602 = 666.

It can be written as a sum of positive squares in only one way, i.e., 101061045801 + 101061045801 = 317901^2 + 317901^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=317901.

It is not an unprimeable number, because it can be changed into a prime (202122091607) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1854423 + ... + 1960389.

Almost surely, 2^202122091602 is an apocalyptic number.

202122091602 is an abundant number, since it is smaller than the sum of its proper divisors (235813239621).

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

202122091602 is an frugal number, since it uses more digits than its factorization.

202122091602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211942 (or 105972 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 202122091602 in words is "two hundred two billion, one hundred twenty-two million, ninety-one thousand, six hundred two".