21098955967 has 2 divisors, whose sum is σ = 21098955968. Its totient is φ = 21098955966.

The previous prime is 21098955937. The next prime is 21098955971. The reversal of 21098955967 is 76955989012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21098955967 - 2¹¹ = 21098953919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21098955937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10549477983 + 10549477984.

It is an arithmetic number, because the mean of its divisors is an integer number (10549477984).

Almost surely, 2^21098955967 is an apocalyptic number.

21098955967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21098955967 is an equidigital number, since it uses as much as digits as its factorization.

21098955967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12247200, while the sum is 61.

The spelling of 21098955967 in words is "twenty-one billion, ninety-eight million, nine hundred fifty-five thousand, nine hundred sixty-seven".