2152024921 has 4 divisors (see below), whose sum is σ = 2153892532. Its totient is φ = 2150157312.

The previous prime is 2152024909. The next prime is 2152024961. The reversal of 2152024921 is 1294202512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1830898521 + 321126400 = 42789^2 + 17920^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152024921 - 2⁷ = 2152024793 is a prime.

It is a super-2 number, since 2×2152024921² = 9262422521210112482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2152024921.

It is not an unprimeable number, because it can be changed into a prime (2152024961) 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, 932076 + ... + 934381.

It is an arithmetic number, because the mean of its divisors is an integer number (538473133).

Almost surely, 2^2152024921 is an apocalyptic number.

It is an amenable number.

2152024921 is a deficient number, since it is larger than the sum of its proper divisors (1867611).

2152024921 is a wasteful number, since it uses less digits than its factorization.

2152024921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867610.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2152024921 is about 46389.9226233457. The cubic root of 2152024921 is about 1291.0679458396.

The spelling of 2152024921 in words is "two billion, one hundred fifty-two million, twenty-four thousand, nine hundred twenty-one".