21121101139 has 2 divisors, whose sum is σ = 21121101140. Its totient is φ = 21121101138.

The previous prime is 21121101109. The next prime is 21121101173. The reversal of 21121101139 is 93110112112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121101139 - 2⁵ = 21121101107 is a prime.

It is a super-3 number, since 3×21121101139³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21121101109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560550569 + 10560550570.

It is an arithmetic number, because the mean of its divisors is an integer number (10560550570).

Almost surely, 2^21121101139 is an apocalyptic number.

21121101139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121101139 is an equidigital number, since it uses as much as digits as its factorization.

21121101139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 22.

The spelling of 21121101139 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, one hundred thirty-nine".