21011212133131 has 4 divisors (see below), whose sum is σ = 22921322327064. Its totient is φ = 19101101939200.

The previous prime is 21011212133129. The next prime is 21011212133137. The reversal of 21011212133131 is 13133121211012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21011212133131 - 2¹ = 21011212133129 is a prime.

It is a super-2 number, since 2×21011212133131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011212133137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955055096950 + ... + 955055096971.

It is an arithmetic number, because the mean of its divisors is an integer number (5730330581766).

Almost surely, 2^{21011212133131} is an apocalyptic number.

21011212133131 is a deficient number, since it is larger than the sum of its proper divisors (1910110193933).

21011212133131 is a wasteful number, since it uses less digits than its factorization.

21011212133131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910110193932.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21011212133131 its reverse (13133121211012), we get a palindrome (34144333344143).

The spelling of 21011212133131 in words is "twenty-one trillion, eleven billion, two hundred twelve million, one hundred thirty-three thousand, one hundred thirty-one".