21100400311 has 2 divisors, whose sum is σ = 21100400312. Its totient is φ = 21100400310.

The previous prime is 21100400281. The next prime is 21100400329. The reversal of 21100400311 is 11300400112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100400311 - 2²⁵ = 21066845879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100400291 and 21100400300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100400341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550200155 + 10550200156.

It is an arithmetic number, because the mean of its divisors is an integer number (10550200156).

Almost surely, 2^21100400311 is an apocalyptic number.

21100400311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100400311 is an equidigital number, since it uses as much as digits as its factorization.

21100400311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21100400311 its reverse (11300400112), we get a palindrome (32400800423).

The spelling of 21100400311 in words is "twenty-one billion, one hundred million, four hundred thousand, three hundred eleven".