21764427674357 has 4 divisors (see below), whose sum is σ = 22270577155200. Its totient is φ = 21258278193516.

The previous prime is 21764427674351. The next prime is 21764427674393. The reversal of 21764427674357 is 75347672446712.

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 a de Polignac number, because none of the positive numbers 2^k-21764427674357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21764427674293 and 21764427674302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21764427674351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253074740357 + ... + 253074740442.

It is an arithmetic number, because the mean of its divisors is an integer number (5567644288800).

Almost surely, 2^{21764427674357} is an apocalyptic number.

It is an amenable number.

21764427674357 is a deficient number, since it is larger than the sum of its proper divisors (506149480843).

21764427674357 is an equidigital number, since it uses as much as digits as its factorization.

21764427674357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506149480842.

The product of its digits is 331914240, while the sum is 65.

The spelling of 21764427674357 in words is "twenty-one trillion, seven hundred sixty-four billion, four hundred twenty-seven million, six hundred seventy-four thousand, three hundred fifty-seven".