202154421 has 32 divisors (see below), whose sum is σ = 318650368. Its totient is φ = 111585600.

The previous prime is 202154419. The next prime is 202154453. The reversal of 202154421 is 124451202.

It is not a de Polignac number, because 202154421 - 2¹ = 202154419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202154461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116466 + ... + 118188.

It is an arithmetic number, because the mean of its divisors is an integer number (9957824).

Almost surely, 2^202154421 is an apocalyptic number.

202154421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202154421 is a deficient number, since it is larger than the sum of its proper divisors (116495947).

202154421 is a wasteful number, since it uses less digits than its factorization.

202154421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 202154421 is about 14218.1018775363. The cubic root of 202154421 is about 586.8959075640.

The spelling of 202154421 in words is "two hundred two million, one hundred fifty-four thousand, four hundred twenty-one".