1972052021 has 4 divisors (see below), whose sum is σ = 1974276192. Its totient is φ = 1969827852.

The previous prime is 1972051973. The next prime is 1972052023. The reversal of 1972052021 is 1202502791.

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 1972052021 - 2¹⁸ = 1971789877 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 (1972052023) 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, 1110755 + ... + 1112528.

It is an arithmetic number, because the mean of its divisors is an integer number (493569048).

Almost surely, 2^1972052021 is an apocalyptic number.

It is an amenable number.

1972052021 is a deficient number, since it is larger than the sum of its proper divisors (2224171).

1972052021 is an equidigital number, since it uses as much as digits as its factorization.

1972052021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224170.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1972052021 is about 44407.7923454882. The cubic root of 1972052021 is about 1254.0247914145.

The spelling of 1972052021 in words is "one billion, nine hundred seventy-two million, fifty-two thousand, twenty-one".