21034321401 has 32 divisors (see below), whose sum is σ = 29550572928. Its totient is φ = 13294333440.

The previous prime is 21034321379. The next prime is 21034321423. The reversal of 21034321401 is 10412343012.

It is an interprime number because it is at equal distance from previous prime (21034321379) and next prime (21034321423).

It is not a de Polignac number, because 21034321401 - 2²⁶ = 20967212537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21034321201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709981 + ... + 739013.

It is an arithmetic number, because the mean of its divisors is an integer number (923455404).

Almost surely, 2^21034321401 is an apocalyptic number.

It is an amenable number.

21034321401 is a deficient number, since it is larger than the sum of its proper divisors (8516251527).

21034321401 is a wasteful number, since it uses less digits than its factorization.

21034321401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29241.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21034321401 its reverse (10412343012), we get a palindrome (31446664413).

The spelling of 21034321401 in words is "twenty-one billion, thirty-four million, three hundred twenty-one thousand, four hundred one".