21510645311 has 2 divisors, whose sum is σ = 21510645312. Its totient is φ = 21510645310.

The previous prime is 21510645301. The next prime is 21510645329. The reversal of 21510645311 is 11354601512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21510645311 - 2²² = 21506451007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21510645301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10755322655 + 10755322656.

It is an arithmetic number, because the mean of its divisors is an integer number (10755322656).

Almost surely, 2^21510645311 is an apocalyptic number.

21510645311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510645311 is an equidigital number, since it uses as much as digits as its factorization.

21510645311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 21510645311 in words is "twenty-one billion, five hundred ten million, six hundred forty-five thousand, three hundred eleven".