21102100951 has 2 divisors, whose sum is σ = 21102100952. Its totient is φ = 21102100950.

The previous prime is 21102100939. The next prime is 21102101029. The reversal of 21102100951 is 15900120112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102100951 - 2⁷ = 21102100823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102100451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551050475 + 10551050476.

It is an arithmetic number, because the mean of its divisors is an integer number (10551050476).

Almost surely, 2^21102100951 is an apocalyptic number.

21102100951 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102100951 is an equidigital number, since it uses as much as digits as its factorization.

21102100951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 22.

The spelling of 21102100951 in words is "twenty-one billion, one hundred two million, one hundred thousand, nine hundred fifty-one".