21858958007 has 2 divisors, whose sum is σ = 21858958008. Its totient is φ = 21858958006.

The previous prime is 21858957943. The next prime is 21858958039. The reversal of 21858958007 is 70085985812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21858958007 - 2⁶ = 21858957943 is a prime.

It is a super-3 number, since 3×21858958007³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21858958007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21858958057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10929479003 + 10929479004.

It is an arithmetic number, because the mean of its divisors is an integer number (10929479004).

Almost surely, 2^21858958007 is an apocalyptic number.

21858958007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21858958007 is an equidigital number, since it uses as much as digits as its factorization.

21858958007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 53.

The spelling of 21858958007 in words is "twenty-one billion, eight hundred fifty-eight million, nine hundred fifty-eight thousand, seven".