146221621 has 16 divisors (see below), whose sum is σ = 184359168. Its totient is φ = 112867200.

The previous prime is 146221619. The next prime is 146221627. The reversal of 146221621 is 126122641.

It is a happy number.

146221621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 146221621 - 2¹ = 146221619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146221627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15865 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (11522448).

Almost surely, 2^146221621 is an apocalyptic number.

It is an amenable number.

146221621 is a deficient number, since it is larger than the sum of its proper divisors (38137547).

146221621 is a wasteful number, since it uses less digits than its factorization.

146221621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39252.

The product of its digits is 1152, while the sum is 25.

The square root of 146221621 is about 12092.2132382786. The cubic root of 146221621 is about 526.8300409584.

The spelling of 146221621 in words is "one hundred forty-six million, two hundred twenty-one thousand, six hundred twenty-one".