2021554045 has 24 divisors (see below), whose sum is σ = 2827885824. Its totient is φ = 1383280416.

The previous prime is 2021554021. The next prime is 2021554049. The reversal of 2021554045 is 5404551202.

It is not a de Polignac number, because 2021554045 - 2¹³ = 2021545853 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 (2021554049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110844 + ... + 127786.

It is an arithmetic number, because the mean of its divisors is an integer number (117828576).

Almost surely, 2^2021554045 is an apocalyptic number.

It is an amenable number.

2021554045 is a deficient number, since it is larger than the sum of its proper divisors (806331779).

2021554045 is a wasteful number, since it uses less digits than its factorization.

2021554045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17449 (or 17442 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 2021554045 is about 44961.6953083400. The cubic root of 2021554045 is about 1264.4309532116.

The spelling of 2021554045 in words is "two billion, twenty-one million, five hundred fifty-four thousand, forty-five".