21090304967 has 2 divisors, whose sum is σ = 21090304968. Its totient is φ = 21090304966.

The previous prime is 21090304943. The next prime is 21090304973. The reversal of 21090304967 is 76940309012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21090304967 - 2⁶ = 21090304903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21090304997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10545152483 + 10545152484.

It is an arithmetic number, because the mean of its divisors is an integer number (10545152484).

Almost surely, 2^21090304967 is an apocalyptic number.

21090304967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21090304967 is an equidigital number, since it uses as much as digits as its factorization.

21090304967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 21090304967 in words is "twenty-one billion, ninety million, three hundred four thousand, nine hundred sixty-seven".