202421421 has 24 divisors (see below), whose sum is σ = 318396000. Its totient is φ = 123433632.

The previous prime is 202421411. The next prime is 202421437. The reversal of 202421421 is 124124202.

202421421 is a `hidden beast` number, since 2 + 0 + 242 + 1 + 421 = 666.

It is not a de Polignac number, because 202421421 - 2¹⁷ = 202290349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202421394 and 202421403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202421411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15451 + ... + 25368.

It is an arithmetic number, because the mean of its divisors is an integer number (13266500).

Almost surely, 2^202421421 is an apocalyptic number.

It is an amenable number.

202421421 is a deficient number, since it is larger than the sum of its proper divisors (115974579).

202421421 is a wasteful number, since it uses less digits than its factorization.

202421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40873 (or 40870 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 202421421 is about 14227.4882182344. The cubic root of 202421421 is about 587.1541792164.

Adding to 202421421 its reverse (124124202), we get a palindrome (326545623).

The spelling of 202421421 in words is "two hundred two million, four hundred twenty-one thousand, four hundred twenty-one".