21221123011131 has 16 divisors (see below), whose sum is σ = 28764143686656. Its totient is φ = 13914287546016.

The previous prime is 21221123011117. The next prime is 21221123011159. The reversal of 21221123011131 is 13111032112212.

It is not a de Polignac number, because 21221123011131 - 2¹¹ = 21221123009083 is a prime.

It is a super-2 number, since 2×21221123011131² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221123011098 and 21221123011107.

It is not an unprimeable number, because it can be changed into a prime (21221123011171) 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, 191032800 + ... + 191143853.

It is an arithmetic number, because the mean of its divisors is an integer number (1797758980416).

Almost surely, 2^{21221123011131} is an apocalyptic number.

21221123011131 is a deficient number, since it is larger than the sum of its proper divisors (7543020675525).

21221123011131 is a wasteful number, since it uses less digits than its factorization.

21221123011131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382176962.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21221123011131 its reverse (13111032112212), we get a palindrome (34332155123343).

The spelling of 21221123011131 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-three million, eleven thousand, one hundred thirty-one".