20013123677621 has 4 divisors (see below), whose sum is σ = 20102868627072. Its totient is φ = 19923378728172.

The previous prime is 20013123677611. The next prime is 20013123677671. The reversal of 20013123677621 is 12677632131002.

It is a happy number.

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-20013123677621 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 (20013123677611) 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, 44872474391 + ... + 44872474836.

It is an arithmetic number, because the mean of its divisors is an integer number (5025717156768).

Almost surely, 2^{20013123677621} is an apocalyptic number.

It is an amenable number.

20013123677621 is a deficient number, since it is larger than the sum of its proper divisors (89744949451).

20013123677621 is an equidigital number, since it uses as much as digits as its factorization.

20013123677621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89744949450.

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 20013123677621 in words is "twenty trillion, thirteen billion, one hundred twenty-three million, six hundred seventy-seven thousand, six hundred twenty-one".