20202421 has 8 divisors (see below), whose sum is σ = 20980224. Its totient is φ = 19432560.

The previous prime is 20202419. The next prime is 20202437. The reversal of 20202421 is 12420202.

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

It is a cyclic number.

It is not a de Polignac number, because 20202421 - 2¹ = 20202419 is a prime.

It is a super-2 number, since 2×20202421² = 816275628522482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202451) 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, 3480 + ... + 7246.

It is an arithmetic number, because the mean of its divisors is an integer number (2622528).

Almost surely, 2^20202421 is an apocalyptic number.

It is an amenable number.

20202421 is a deficient number, since it is larger than the sum of its proper divisors (777803).

20202421 is a wasteful number, since it uses less digits than its factorization.

20202421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20202421 is about 4494.7103354944. The cubic root of 20202421 is about 272.3544479826.

Adding to 20202421 its reverse (12420202), we get a palindrome (32622623).

The spelling of 20202421 in words is "twenty million, two hundred two thousand, four hundred twenty-one".