2978125021 has 4 divisors (see below), whose sum is σ = 2982845344. Its totient is φ = 2973404700.

The previous prime is 2978124979. The next prime is 2978125039. The reversal of 2978125021 is 1205218792.

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 not a de Polignac number, because 2978125021 - 2⁹ = 2978124509 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 (2978125121) 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, 2359215 + ... + 2360476.

It is an arithmetic number, because the mean of its divisors is an integer number (745711336).

Almost surely, 2^2978125021 is an apocalyptic number.

It is an amenable number.

2978125021 is a deficient number, since it is larger than the sum of its proper divisors (4720323).

2978125021 is an equidigital number, since it uses as much as digits as its factorization.

2978125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4720322.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 2978125021 is about 54572.2000747633. The cubic root of 2978125021 is about 1438.7355510660.

The spelling of 2978125021 in words is "two billion, nine hundred seventy-eight million, one hundred twenty-five thousand, twenty-one".