21221102100239 has 2 divisors, whose sum is σ = 21221102100240. Its totient is φ = 21221102100238.

The previous prime is 21221102100157. The next prime is 21221102100251. The reversal of 21221102100239 is 93200120112212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221102100239 - 2¹² = 21221102096143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221102105239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610551050119 + 10610551050120.

It is an arithmetic number, because the mean of its divisors is an integer number (10610551050120).

Almost surely, 2^{21221102100239} is an apocalyptic number.

21221102100239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221102100239 is an equidigital number, since it uses as much as digits as its factorization.

21221102100239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21221102100239 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred thousand, two hundred thirty-nine".