120402421 has 4 divisors (see below), whose sum is σ = 122443200. Its totient is φ = 118361644.

The previous prime is 120402371. The next prime is 120402427. The reversal of 120402421 is 124204021.

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.

It is a cyclic number.

It is not a de Polignac number, because 120402421 - 2⁹ = 120401909 is a prime.

It is a super-2 number, since 2×120402421² = 28993485965322482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120402395 and 120402404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120402427) 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, 1020301 + ... + 1020418.

It is an arithmetic number, because the mean of its divisors is an integer number (30610800).

Almost surely, 2^120402421 is an apocalyptic number.

It is an amenable number.

120402421 is a deficient number, since it is larger than the sum of its proper divisors (2040779).

120402421 is an equidigital number, since it uses as much as digits as its factorization.

120402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040778.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 120402421 is about 10972.8036982350. The cubic root of 120402421 is about 493.7931638599.

Adding to 120402421 its reverse (124204021), we get a palindrome (244606442).

The spelling of 120402421 in words is "one hundred twenty million, four hundred two thousand, four hundred twenty-one".