2472656921 has 4 divisors (see below), whose sum is σ = 2825893632. Its totient is φ = 2119420212.

The previous prime is 2472656891. The next prime is 2472656933. The reversal of 2472656921 is 1296562742.

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: 1296562742 = 2 ⋅648281371.

It is not a de Polignac number, because 2472656921 - 2¹⁰ = 2472655897 is a prime.

It is a super-2 number, since 2×2472656921² = 12228064497938400482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2472656951) 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, 176618345 + ... + 176618358.

It is an arithmetic number, because the mean of its divisors is an integer number (706473408).

Almost surely, 2^2472656921 is an apocalyptic number.

It is an amenable number.

2472656921 is a deficient number, since it is larger than the sum of its proper divisors (353236711).

2472656921 is an equidigital number, since it uses as much as digits as its factorization.

2472656921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353236710.

The product of its digits is 362880, while the sum is 44.

The square root of 2472656921 is about 49725.8174492889. The cubic root of 2472656921 is about 1352.2426229214.

The spelling of 2472656921 in words is "two billion, four hundred seventy-two million, six hundred fifty-six thousand, nine hundred twenty-one".