120021554100621 has 4 divisors (see below), whose sum is σ = 160028738800832. Its totient is φ = 80014369400412.

The previous prime is 120021554100559. The next prime is 120021554100649. The reversal of 120021554100621 is 126001455120021.

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 not a de Polignac number, because 120021554100621 - 2¹⁰ = 120021554099597 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 (120021554100661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20003592350101 + ... + 20003592350106.

It is an arithmetic number, because the mean of its divisors is an integer number (40007184700208).

Almost surely, 2^{120021554100621} is an apocalyptic number.

It is an amenable number.

120021554100621 is a deficient number, since it is larger than the sum of its proper divisors (40007184700211).

120021554100621 is an equidigital number, since it uses as much as digits as its factorization.

120021554100621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40007184700210.

The product of its (nonzero) digits is 4800, while the sum is 30.

The spelling of 120021554100621 in words is "one hundred twenty trillion, twenty-one billion, five hundred fifty-four million, one hundred thousand, six hundred twenty-one".