1554020979021 has 12 divisors (see below), whose sum is σ = 2565367965472. Its totient is φ = 888011987976.

The previous prime is 1554020978929. The next prime is 1554020979061. The reversal of 1554020979021 is 1209790204551.

1554020979021 is a `hidden beast` number, since 1 + 55 + 402 + 0 + 97 + 90 + 21 = 666.

It is not a de Polignac number, because 1554020979021 - 2¹¹ = 1554020976973 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 (1554020979061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12333499771 + ... + 12333499896.

Almost surely, 2^{1554020979021} is an apocalyptic number.

It is an amenable number.

1554020979021 is a deficient number, since it is larger than the sum of its proper divisors (1011346986451).

1554020979021 is a wasteful number, since it uses less digits than its factorization.

1554020979021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24666999680 (or 24666999677 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The spelling of 1554020979021 in words is "one trillion, five hundred fifty-four billion, twenty million, nine hundred seventy-nine thousand, twenty-one".