21220111931131 has 2 divisors, whose sum is σ = 21220111931132. Its totient is φ = 21220111931130.

The previous prime is 21220111931093. The next prime is 21220111931153. The reversal of 21220111931131 is 13113911102212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21220111931131 - 2¹⁷ = 21220111800059 is a prime.

It is a super-2 number, since 2×21220111931131² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220111931131.

It is not a weakly prime, because it can be changed into another prime (21220111931171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610055965565 + 10610055965566.

It is an arithmetic number, because the mean of its divisors is an integer number (10610055965566).

Almost surely, 2^{21220111931131} is an apocalyptic number.

21220111931131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220111931131 is an equidigital number, since it uses as much as digits as its factorization.

21220111931131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 21220111931131 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, nine hundred thirty-one thousand, one hundred thirty-one".