20331001421 has 4 divisors (see below), whose sum is σ = 20350722144. Its totient is φ = 20311280700.

The previous prime is 20331001399. The next prime is 20331001451. The reversal of 20331001421 is 12410013302.

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 20331001421 - 2¹⁸ = 20330739277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20331001421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331001451) 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, 9858815 + ... + 9860876.

It is an arithmetic number, because the mean of its divisors is an integer number (5087680536).

Almost surely, 2^20331001421 is an apocalyptic number.

It is an amenable number.

20331001421 is a deficient number, since it is larger than the sum of its proper divisors (19720723).

20331001421 is a wasteful number, since it uses less digits than its factorization.

20331001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19720722.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20331001421 its reverse (12410013302), we get a palindrome (32741014723).

The spelling of 20331001421 in words is "twenty billion, three hundred thirty-one million, one thousand, four hundred twenty-one".