21390064295 has 4 divisors (see below), whose sum is σ = 25668077160. Its totient is φ = 17112051432.

The previous prime is 21390064291. The next prime is 21390064313. The reversal of 21390064295 is 59246009312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21390064295 - 2² = 21390064291 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21390064291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139006425 + ... + 2139006434.

It is an arithmetic number, because the mean of its divisors is an integer number (6417019290).

Almost surely, 2^21390064295 is an apocalyptic number.

21390064295 is a deficient number, since it is larger than the sum of its proper divisors (4278012865).

21390064295 is an equidigital number, since it uses as much as digits as its factorization.

21390064295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278012864.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 21390064295 in words is "twenty-one billion, three hundred ninety million, sixty-four thousand, two hundred ninety-five".