153427721 has 4 divisors (see below), whose sum is σ = 153661200. Its totient is φ = 153194244.

The previous prime is 153427709. The next prime is 153427751. The reversal of 153427721 is 127724351.

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 153427721 - 2⁶ = 153427657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (153427751) 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, 115751 + ... + 117068.

It is an arithmetic number, because the mean of its divisors is an integer number (38415300).

Almost surely, 2^153427721 is an apocalyptic number.

It is an amenable number.

153427721 is a deficient number, since it is larger than the sum of its proper divisors (233479).

153427721 is an equidigital number, since it uses as much as digits as its factorization.

153427721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233478.

The product of its digits is 11760, while the sum is 32.

The square root of 153427721 is about 12386.5944068578. The cubic root of 153427721 is about 535.3460607877.

The spelling of 153427721 in words is "one hundred fifty-three million, four hundred twenty-seven thousand, seven hundred twenty-one".