21101220110951 has 2 divisors, whose sum is σ = 21101220110952. Its totient is φ = 21101220110950.

The previous prime is 21101220110941. The next prime is 21101220111001. The reversal of 21101220110951 is 15901102210112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101220110951 - 2²⁶ = 21101153002087 is a prime.

It is a super-2 number, since 2×21101220110951² (a number of 27 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 21101220110951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101220110941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550610055475 + 10550610055476.

It is an arithmetic number, because the mean of its divisors is an integer number (10550610055476).

Almost surely, 2^{21101220110951} is an apocalyptic number.

21101220110951 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101220110951 is an equidigital number, since it uses as much as digits as its factorization.

21101220110951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 26.

The spelling of 21101220110951 in words is "twenty-one trillion, one hundred one billion, two hundred twenty million, one hundred ten thousand, nine hundred fifty-one".