21522313311 has 16 divisors (see below), whose sum is σ = 29687400288. Its totient is φ = 13859648000.

The previous prime is 21522313303. The next prime is 21522313313. The reversal of 21522313311 is 11331322512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21522313311 - 2³ = 21522313303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522313313) 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, 853806 + ... + 878651.

It is an arithmetic number, because the mean of its divisors is an integer number (1855462518).

Almost surely, 2^21522313311 is an apocalyptic number.

21522313311 is a deficient number, since it is larger than the sum of its proper divisors (8165086977).

21522313311 is a wasteful number, since it uses less digits than its factorization.

21522313311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732602.

The product of its digits is 1080, while the sum is 24.

Adding to 21522313311 its reverse (11331322512), we get a palindrome (32853635823).

The spelling of 21522313311 in words is "twenty-one billion, five hundred twenty-two million, three hundred thirteen thousand, three hundred eleven".