21345702502775 has 24 divisors (see below), whose sum is σ = 30316102308960. Its totient is φ = 14605024527360.

The previous prime is 21345702502697. The next prime is 21345702502799. The reversal of 21345702502775 is 57720520754312.

It is a de Polignac number, because none of the positive numbers 2^k-21345702502775 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133372370 + ... + 133532319.

It is an arithmetic number, because the mean of its divisors is an integer number (1263170929540).

Almost surely, 2^{21345702502775} is an apocalyptic number.

21345702502775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21345702502775 is a deficient number, since it is larger than the sum of its proper divisors (8970399806185).

21345702502775 is a wasteful number, since it uses less digits than its factorization.

21345702502775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266905163 (or 266905158 counting only the distinct ones).

The product of its (nonzero) digits is 4116000, while the sum is 50.

The spelling of 21345702502775 in words is "twenty-one trillion, three hundred forty-five billion, seven hundred two million, five hundred two thousand, seven hundred seventy-five".