2021554004 has 6 divisors (see below), whose sum is σ = 3537719514. Its totient is φ = 1010777000.

The previous prime is 2021553983. The next prime is 2021554021. The reversal of 2021554004 is 4004551202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1267502404 + 754051600 = 35602^2 + 27460^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252694247 + ... + 252694254.

It is an arithmetic number, because the mean of its divisors is an integer number (589619919).

Almost surely, 2^2021554004 is an apocalyptic number.

It is an amenable number.

2021554004 is a deficient number, since it is larger than the sum of its proper divisors (1516165510).

2021554004 is a wasteful number, since it uses less digits than its factorization.

2021554004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505388505 (or 505388503 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 2021554004 is about 44961.6948523963. The cubic root of 2021554004 is about 1264.4309446635.

The spelling of 2021554004 in words is "two billion, twenty-one million, five hundred fifty-four thousand, four".