220451021 has 16 divisors (see below), whose sum is σ = 266513664. Its totient is φ = 178257024.

The previous prime is 220451017. The next prime is 220451029. The reversal of 220451021 is 120154022.

220451021 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 220451021 - 2² = 220451017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220451029) 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, 2375 + ... + 21131.

It is an arithmetic number, because the mean of its divisors is an integer number (16657104).

Almost surely, 2^220451021 is an apocalyptic number.

It is an amenable number.

220451021 is a deficient number, since it is larger than the sum of its proper divisors (46062643).

220451021 is a wasteful number, since it uses less digits than its factorization.

220451021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18860.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 220451021 is about 14847.5931046079. The cubic root of 220451021 is about 604.0933266970.

The spelling of 220451021 in words is "two hundred twenty million, four hundred fifty-one thousand, twenty-one".