3972052021 has 4 divisors (see below), whose sum is σ = 4539488032. Its totient is φ = 3404616012.

The previous prime is 3972052013. The next prime is 3972052031. The reversal of 3972052021 is 1202502793.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1202502793 = 73 ⋅16472641.

It is not a de Polignac number, because 3972052021 - 2³ = 3972052013 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 (3972052031) 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, 283717995 + ... + 283718008.

It is an arithmetic number, because the mean of its divisors is an integer number (1134872008).

Almost surely, 2^3972052021 is an apocalyptic number.

It is an amenable number.

3972052021 is a deficient number, since it is larger than the sum of its proper divisors (567436011).

3972052021 is an equidigital number, since it uses as much as digits as its factorization.

3972052021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567436010.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 3972052021 is about 63024.2177341377. The cubic root of 3972052021 is about 1583.6953536839.

The spelling of 3972052021 in words is "three billion, nine hundred seventy-two million, fifty-two thousand, twenty-one".