202021989 has 8 divisors (see below), whose sum is σ = 290082912. Its totient is φ = 124321200.

The previous prime is 202021987. The next prime is 202021991. The reversal of 202021989 is 989120202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (202021987) and next prime (202021991).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202021989 - 2¹ = 202021987 is a prime.

It is a super-2 number, since 2×202021989² = 81625768079032242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202021987) 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, 2589987 + ... + 2590064.

It is an arithmetic number, because the mean of its divisors is an integer number (36260364).

Almost surely, 2^202021989 is an apocalyptic number.

It is an amenable number.

202021989 is a deficient number, since it is larger than the sum of its proper divisors (88060923).

202021989 is a wasteful number, since it uses less digits than its factorization.

202021989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180067.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 202021989 is about 14213.4439528216. The cubic root of 202021989 is about 586.7677204468.

The spelling of 202021989 in words is "two hundred two million, twenty-one thousand, nine hundred eighty-nine".