21023201311 has 16 divisors (see below), whose sum is σ = 24212353536. Its totient is φ = 17880885216.

The previous prime is 21023201279. The next prime is 21023201321. The reversal of 21023201311 is 11310232012.

It is a cyclic number.

It is not a de Polignac number, because 21023201311 - 2⁵ = 21023201279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023201321) 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, 670885 + ... + 701521.

It is an arithmetic number, because the mean of its divisors is an integer number (1513272096).

Almost surely, 2^21023201311 is an apocalyptic number.

21023201311 is a deficient number, since it is larger than the sum of its proper divisors (3189152225).

21023201311 is a wasteful number, since it uses less digits than its factorization.

21023201311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31398.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21023201311 its reverse (11310232012), we get a palindrome (32333433323).

The spelling of 21023201311 in words is "twenty-one billion, twenty-three million, two hundred one thousand, three hundred eleven".