146121721 has 4 divisors (see below), whose sum is σ = 146147200. Its totient is φ = 146096244.

The previous prime is 146121683. The next prime is 146121727. The reversal of 146121721 is 127121641.

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 146121721 - 2¹⁹ = 145597433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146121727) 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, 340 + ... + 17098.

It is an arithmetic number, because the mean of its divisors is an integer number (36536800).

Almost surely, 2^146121721 is an apocalyptic number.

It is an amenable number.

146121721 is a deficient number, since it is larger than the sum of its proper divisors (25479).

146121721 is an equidigital number, since it uses as much as digits as its factorization.

146121721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25478.

The product of its digits is 672, while the sum is 25.

The square root of 146121721 is about 12088.0817750378. The cubic root of 146121721 is about 526.7100351956.

The spelling of 146121721 in words is "one hundred forty-six million, one hundred twenty-one thousand, seven hundred twenty-one".