10179220921 has 4 divisors (see below), whose sum is σ = 10427494644. Its totient is φ = 9930947200.

The previous prime is 10179220901. The next prime is 10179220927. The reversal of 10179220921 is 12902297101.

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 811110400 + 9368110521 = 28480^2 + 96789^2 .

It is a cyclic number.

It is not a de Polignac number, because 10179220921 - 2¹⁵ = 10179188153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10179220927) 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, 124136800 + ... + 124136881.

It is an arithmetic number, because the mean of its divisors is an integer number (2606873661).

Almost surely, 2^10179220921 is an apocalyptic number.

It is an amenable number.

10179220921 is a deficient number, since it is larger than the sum of its proper divisors (248273723).

10179220921 is an equidigital number, since it uses as much as digits as its factorization.

10179220921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248273722.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 10179220921 in words is "ten billion, one hundred seventy-nine million, two hundred twenty thousand, nine hundred twenty-one".