21221010100139 has 2 divisors, whose sum is σ = 21221010100140. Its totient is φ = 21221010100138.

The previous prime is 21221010100067. The next prime is 21221010100253. The reversal of 21221010100139 is 93100101012212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221010100139 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221010108139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610505050069 + 10610505050070.

It is an arithmetic number, because the mean of its divisors is an integer number (10610505050070).

Almost surely, 2^{21221010100139} is an apocalyptic number.

21221010100139 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221010100139 is an equidigital number, since it uses as much as digits as its factorization.

21221010100139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21221010100139 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, one hundred thousand, one hundred thirty-nine".