21321011431519 has 2 divisors, whose sum is σ = 21321011431520. Its totient is φ = 21321011431518.

The previous prime is 21321011431471. The next prime is 21321011431523. The reversal of 21321011431519 is 91513411012312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321011431519 - 2⁹ = 21321011431007 is a prime.

It is a super-2 number, since 2×21321011431519² (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 (21321011431319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660505715759 + 10660505715760.

It is an arithmetic number, because the mean of its divisors is an integer number (10660505715760).

Almost surely, 2^{21321011431519} is an apocalyptic number.

21321011431519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321011431519 is an equidigital number, since it uses as much as digits as its factorization.

21321011431519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 21321011431519 in words is "twenty-one trillion, three hundred twenty-one billion, eleven million, four hundred thirty-one thousand, five hundred nineteen".