21510052211399 has 2 divisors, whose sum is σ = 21510052211400. Its totient is φ = 21510052211398.

The previous prime is 21510052211387. The next prime is 21510052211407. The reversal of 21510052211399 is 99311225001512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21510052211399 - 2⁸ = 21510052211143 is a prime.

It is a super-2 number, since 2×21510052211399² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21510052211899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10755026105699 + 10755026105700.

It is an arithmetic number, because the mean of its divisors is an integer number (10755026105700).

Almost surely, 2^{21510052211399} is an apocalyptic number.

21510052211399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21510052211399 is an equidigital number, since it uses as much as digits as its factorization.

21510052211399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 41.

The spelling of 21510052211399 in words is "twenty-one trillion, five hundred ten billion, fifty-two million, two hundred eleven thousand, three hundred ninety-nine".