120694402921 has 3 divisors (see below), whose sum is σ = 120694750333. Its totient is φ = 120694055510.

The previous prime is 120694402919. The next prime is 120694403033. The reversal of 120694402921 is 129204496021.

The square root of 120694402921 is 347411.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 120694402921 - 2¹ = 120694402919 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120694405921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 173706 + ... + 521116.

Almost surely, 2^120694402921 is an apocalyptic number.

120694402921 is the 347411-st square number.

120694402921 is the 173706-th centered octagonal number.

It is an amenable number.

120694402921 is a deficient number, since it is larger than the sum of its proper divisors (347412).

120694402921 is an frugal number, since it uses more digits than its factorization.

120694402921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694822 (or 347411 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

Adding to 120694402921 its reverse (129204496021), we get a palindrome (249898898942).

The spelling of 120694402921 in words is "one hundred twenty billion, six hundred ninety-four million, four hundred two thousand, nine hundred twenty-one".