21211155139 has 2 divisors, whose sum is σ = 21211155140. Its totient is φ = 21211155138.

The previous prime is 21211155113. The next prime is 21211155157. The reversal of 21211155139 is 93155111212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211155139 - 2⁵ = 21211155107 is a prime.

It is a super-2 number, since 2×21211155139² (a number of 21 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 21211155139.

It is not a weakly prime, because it can be changed into another prime (21211155239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605577569 + 10605577570.

It is an arithmetic number, because the mean of its divisors is an integer number (10605577570).

Almost surely, 2^21211155139 is an apocalyptic number.

21211155139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211155139 is an equidigital number, since it uses as much as digits as its factorization.

21211155139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 31.

The spelling of 21211155139 in words is "twenty-one billion, two hundred eleven million, one hundred fifty-five thousand, one hundred thirty-nine".