21397260707 has 2 divisors, whose sum is σ = 21397260708. Its totient is φ = 21397260706.

The previous prime is 21397260701. The next prime is 21397260737. The reversal of 21397260707 is 70706279312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21397260707 - 2¹⁰ = 21397259683 is a prime.

It is a super-2 number, since 2×21397260707² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21397260701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10698630353 + 10698630354.

It is an arithmetic number, because the mean of its divisors is an integer number (10698630354).

Almost surely, 2^21397260707 is an apocalyptic number.

21397260707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21397260707 is an equidigital number, since it uses as much as digits as its factorization.

21397260707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 44.

The spelling of 21397260707 in words is "twenty-one billion, three hundred ninety-seven million, two hundred sixty thousand, seven hundred seven".