21312240007739 has 2 divisors, whose sum is σ = 21312240007740. Its totient is φ = 21312240007738.

The previous prime is 21312240007673. The next prime is 21312240007781. The reversal of 21312240007739 is 93770004221312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21312240007739 - 2²⁴ = 21312223230523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312240007696 and 21312240007705.

It is not a weakly prime, because it can be changed into another prime (21312240003739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656120003869 + 10656120003870.

It is an arithmetic number, because the mean of its divisors is an integer number (10656120003870).

Almost surely, 2^{21312240007739} is an apocalyptic number.

21312240007739 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312240007739 is an equidigital number, since it uses as much as digits as its factorization.

21312240007739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 21312240007739 in words is "twenty-one trillion, three hundred twelve billion, two hundred forty million, seven thousand, seven hundred thirty-nine".