161447021 has 16 divisors (see below), whose sum is σ = 170463744. Its totient is φ = 152722944.

The previous prime is 161447017. The next prime is 161447023. The reversal of 161447021 is 120744161.

It is a cyclic number.

It is not a de Polignac number, because 161447021 - 2² = 161447017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161447023) 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, 457181 + ... + 457533.

It is an arithmetic number, because the mean of its divisors is an integer number (10653984).

Almost surely, 2^161447021 is an apocalyptic number.

It is an amenable number.

161447021 is a deficient number, since it is larger than the sum of its proper divisors (9016723).

161447021 is a wasteful number, since it uses less digits than its factorization.

161447021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 161447021 is about 12706.1804252891. The cubic root of 161447021 is about 544.5152056192.

The spelling of 161447021 in words is "one hundred sixty-one million, four hundred forty-seven thousand, twenty-one".