21321100012131 has 12 divisors (see below), whose sum is σ = 30797798096520. Its totient is φ = 14213764997280.

The previous prime is 21321100012129. The next prime is 21321100012151. The reversal of 21321100012131 is 13121000112312.

It is not a de Polignac number, because 21321100012131 - 2¹ = 21321100012129 is a prime.

It is a super-2 number, since 2×21321100012131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321100012151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24691761 + ... + 25540658.

It is an arithmetic number, because the mean of its divisors is an integer number (2566483174710).

Almost surely, 2^{21321100012131} is an apocalyptic number.

21321100012131 is a deficient number, since it is larger than the sum of its proper divisors (9476698084389).

21321100012131 is a wasteful number, since it uses less digits than its factorization.

21321100012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50279586 (or 50279583 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21321100012131 its reverse (13121000112312), we get a palindrome (34442100124443).

The spelling of 21321100012131 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred million, twelve thousand, one hundred thirty-one".