20122401421 has 4 divisors (see below), whose sum is σ = 21181475200. Its totient is φ = 19063327644.

The previous prime is 20122401367. The next prime is 20122401433. The reversal of 20122401421 is 12410422102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20122401421 - 2²⁵ = 20088846989 is a prime.

It is a super-2 number, since 2×20122401421² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1059073759 = 20122401421 / (2 + 0 + 1 + 2 + 2 + 4 + 0 + 1 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122401451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529536861 + ... + 529536898.

It is an arithmetic number, because the mean of its divisors is an integer number (5295368800).

Almost surely, 2^20122401421 is an apocalyptic number.

It is an amenable number.

20122401421 is a deficient number, since it is larger than the sum of its proper divisors (1059073779).

20122401421 is a wasteful number, since it uses less digits than its factorization.

20122401421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059073778.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20122401421 its reverse (12410422102), we get a palindrome (32532823523).

The spelling of 20122401421 in words is "twenty billion, one hundred twenty-two million, four hundred one thousand, four hundred twenty-one".