21012132311 has 16 divisors (see below), whose sum is σ = 22361961600. Its totient is φ = 19675115520.

The previous prime is 21012132283. The next prime is 21012132329. The reversal of 21012132311 is 11323121012.

It is a cyclic number.

It is not a de Polignac number, because 21012132311 - 2²⁶ = 20945023447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21012132311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012132371) 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, 6090515 + ... + 6093963.

It is an arithmetic number, because the mean of its divisors is an integer number (1397622600).

Almost surely, 2^21012132311 is an apocalyptic number.

21012132311 is a deficient number, since it is larger than the sum of its proper divisors (1349829289).

21012132311 is a wasteful number, since it uses less digits than its factorization.

21012132311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21012132311 its reverse (11323121012), we get a palindrome (32335253323).

The spelling of 21012132311 in words is "twenty-one billion, twelve million, one hundred thirty-two thousand, three hundred eleven".