21050423401 has 16 divisors (see below), whose sum is σ = 25494215040. Its totient is φ = 16996129920.

The previous prime is 21050423389. The next prime is 21050423441. The reversal of 21050423401 is 10432405012.

It is not a de Polignac number, because 21050423401 - 2¹³ = 21050415209 is a prime.

It is a super-2 number, since 2×21050423401² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21050423441) 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, 1256271 + ... + 1272916.

It is an arithmetic number, because the mean of its divisors is an integer number (1593388440).

Almost surely, 2^21050423401 is an apocalyptic number.

It is an amenable number.

21050423401 is a deficient number, since it is larger than the sum of its proper divisors (4443791639).

21050423401 is a wasteful number, since it uses less digits than its factorization.

21050423401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2529264.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21050423401 its reverse (10432405012), we get a palindrome (31482828413).

The spelling of 21050423401 in words is "twenty-one billion, fifty million, four hundred twenty-three thousand, four hundred one".