21113015133 has 16 divisors (see below), whose sum is σ = 32193276416. Its totient is φ = 12056681520.

The previous prime is 21113015129. The next prime is 21113015141. The reversal of 21113015133 is 33151031112.

It is not a de Polignac number, because 21113015133 - 2² = 21113015129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113015153) 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, 296191 + ... + 360492.

It is an arithmetic number, because the mean of its divisors is an integer number (2012079776).

Almost surely, 2^21113015133 is an apocalyptic number.

It is an amenable number.

21113015133 is a deficient number, since it is larger than the sum of its proper divisors (11080261283).

21113015133 is a wasteful number, since it uses less digits than its factorization.

21113015133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658224.

The product of its (nonzero) digits is 270, while the sum is 21.

Adding to 21113015133 its reverse (33151031112), we get a palindrome (54264046245).

The spelling of 21113015133 in words is "twenty-one billion, one hundred thirteen million, fifteen thousand, one hundred thirty-three".