21002222100131 has 4 divisors (see below), whose sum is σ = 21002335085664. Its totient is φ = 21002109114600.

The previous prime is 21002222100109. The next prime is 21002222100137. The reversal of 21002222100131 is 13100122220012.

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 21002222100131 - 2¹⁰ = 21002222099107 is a prime.

It is a super-2 number, since 2×21002222100131² (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 (21002222100137) 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, 56213480 + ... + 56585861.

It is an arithmetic number, because the mean of its divisors is an integer number (5250583771416).

Almost surely, 2^{21002222100131} is an apocalyptic number.

21002222100131 is a deficient number, since it is larger than the sum of its proper divisors (112985533).

21002222100131 is a wasteful number, since it uses less digits than its factorization.

21002222100131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112985532.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21002222100131 its reverse (13100122220012), we get a palindrome (34102344320143).

The spelling of 21002222100131 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred thousand, one hundred thirty-one".