20102522421 has 16 divisors (see below), whose sum is σ = 27837619200. Its totient is φ = 12894219888.

The previous prime is 20102522381. The next prime is 20102522437. The reversal of 20102522421 is 12422520102.

It is not a de Polignac number, because 20102522421 - 2²⁶ = 20035413557 is a prime.

It is a super-2 number, since 2×20102522421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102522221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199911 + ... + 1216548.

It is an arithmetic number, because the mean of its divisors is an integer number (1739851200).

Almost surely, 2^20102522421 is an apocalyptic number.

It is an amenable number.

20102522421 is a deficient number, since it is larger than the sum of its proper divisors (7735096779).

20102522421 is a wasteful number, since it uses less digits than its factorization.

20102522421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416568.

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

It can be divided in two parts, 201025 and 22421, that added together give a triangular number (223446 = T₆₆₈).

The spelling of 20102522421 in words is "twenty billion, one hundred two million, five hundred twenty-two thousand, four hundred twenty-one".