21100213139 has 2 divisors, whose sum is σ = 21100213140. Its totient is φ = 21100213138.

The previous prime is 21100213109. The next prime is 21100213159. The reversal of 21100213139 is 93131200112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100213139 - 2¹² = 21100209043 is a prime.

It is a super-2 number, since 2×21100213139² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21100213109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550106569 + 10550106570.

It is an arithmetic number, because the mean of its divisors is an integer number (10550106570).

Almost surely, 2^21100213139 is an apocalyptic number.

21100213139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100213139 is an equidigital number, since it uses as much as digits as its factorization.

21100213139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The spelling of 21100213139 in words is "twenty-one billion, one hundred million, two hundred thirteen thousand, one hundred thirty-nine".