21512423235311 has 2 divisors, whose sum is σ = 21512423235312. Its totient is φ = 21512423235310.

The previous prime is 21512423235287. The next prime is 21512423235341. The reversal of 21512423235311 is 11353232421512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21512423235311 - 2²² = 21512419041007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21512423235341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756211617655 + 10756211617656.

It is an arithmetic number, because the mean of its divisors is an integer number (10756211617656).

Almost surely, 2^{21512423235311} is an apocalyptic number.

21512423235311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21512423235311 is an equidigital number, since it uses as much as digits as its factorization.

21512423235311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

Adding to 21512423235311 its reverse (11353232421512), we get a palindrome (32865655656823).

The spelling of 21512423235311 in words is "twenty-one trillion, five hundred twelve billion, four hundred twenty-three million, two hundred thirty-five thousand, three hundred eleven".