20310454621621 has 4 divisors (see below), whose sum is σ = 20567548984000. Its totient is φ = 20053360259244.

The previous prime is 20310454621609. The next prime is 20310454621669. The reversal of 20310454621621 is 12612645401302.

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 20310454621621 - 2²¹ = 20310452524469 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 (20310454661621) 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, 128547181071 + ... + 128547181228.

It is an arithmetic number, because the mean of its divisors is an integer number (5141887246000).

Almost surely, 2^{20310454621621} is an apocalyptic number.

It is an amenable number.

20310454621621 is a deficient number, since it is larger than the sum of its proper divisors (257094362379).

20310454621621 is an equidigital number, since it uses as much as digits as its factorization.

20310454621621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257094362378.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 20310454621621 in words is "twenty trillion, three hundred ten billion, four hundred fifty-four million, six hundred twenty-one thousand, six hundred twenty-one".