422153721 has 32 divisors (see below), whose sum is σ = 686125440. Its totient is φ = 254404800.

The previous prime is 422153713. The next prime is 422153729. The reversal of 422153721 is 127351224.

It is an interprime number because it is at equal distance from previous prime (422153713) and next prime (422153729).

It is not a de Polignac number, because 422153721 - 2³ = 422153713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (422153729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49831 + ... + 57683.

It is an arithmetic number, because the mean of its divisors is an integer number (21441420).

Almost surely, 2^422153721 is an apocalyptic number.

It is an amenable number.

422153721 is a deficient number, since it is larger than the sum of its proper divisors (263971719).

422153721 is a wasteful number, since it uses less digits than its factorization.

422153721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8054 (or 8048 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 422153721 is about 20546.3797541075. The cubic root of 422153721 is about 750.1651316394.

The spelling of 422153721 in words is "four hundred twenty-two million, one hundred fifty-three thousand, seven hundred twenty-one".