21777402707 has 2 divisors, whose sum is σ = 21777402708. Its totient is φ = 21777402706.

The previous prime is 21777402697. The next prime is 21777402719. The reversal of 21777402707 is 70720477712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21777402707 - 2¹⁶ = 21777337171 is a prime.

It is not a weakly prime, because it can be changed into another prime (21777402737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10888701353 + 10888701354.

It is an arithmetic number, because the mean of its divisors is an integer number (10888701354).

Almost surely, 2^21777402707 is an apocalyptic number.

21777402707 is a deficient number, since it is larger than the sum of its proper divisors (1).

21777402707 is an equidigital number, since it uses as much as digits as its factorization.

21777402707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268912, while the sum is 44.

The spelling of 21777402707 in words is "twenty-one billion, seven hundred seventy-seven million, four hundred two thousand, seven hundred seven".