21862257997 has 4 divisors (see below), whose sum is σ = 22138995520. Its totient is φ = 21585520476.

The previous prime is 21862257973. The next prime is 21862258001. The reversal of 21862257997 is 79975226812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21862257997 - 2³¹ = 19714774349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21862257497) 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, 138368643 + ... + 138368800.

It is an arithmetic number, because the mean of its divisors is an integer number (5534748880).

Almost surely, 2^21862257997 is an apocalyptic number.

It is an amenable number.

21862257997 is a deficient number, since it is larger than the sum of its proper divisors (276737523).

21862257997 is an equidigital number, since it uses as much as digits as its factorization.

21862257997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276737522.

The product of its digits is 7620480, while the sum is 58.

The spelling of 21862257997 in words is "twenty-one billion, eight hundred sixty-two million, two hundred fifty-seven thousand, nine hundred ninety-seven".