7436620921 has 4 divisors (see below), whose sum is σ = 7437609972. Its totient is φ = 7435631872.

The previous prime is 7436620901. The next prime is 7436620927. The reversal of 7436620921 is 1290266347.

It is a happy number.

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 3472155625 + 3964465296 = 58925^2 + 62964^2 .

It is a cyclic number.

It is not a de Polignac number, because 7436620921 - 2⁹ = 7436620409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7436620927) 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, 483160 + ... + 498313.

It is an arithmetic number, because the mean of its divisors is an integer number (1859402493).

Almost surely, 2^7436620921 is an apocalyptic number.

It is an amenable number.

7436620921 is a deficient number, since it is larger than the sum of its proper divisors (989051).

7436620921 is an equidigital number, since it uses as much as digits as its factorization.

7436620921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989050.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 7436620921 is about 86235.8447572702. The cubic root of 7436620921 is about 1951.9044222811.

The spelling of 7436620921 in words is "seven billion, four hundred thirty-six million, six hundred twenty thousand, nine hundred twenty-one".