201070021 has 16 divisors (see below), whose sum is σ = 213903360. Its totient is φ = 188677440.

The previous prime is 201070007. The next prime is 201070049. The reversal of 201070021 is 120070102.

It is a cyclic number.

It is not a de Polignac number, because 201070021 - 2⁹ = 201069509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201069983 and 201070010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201070081) 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, 477391 + ... + 477811.

It is an arithmetic number, because the mean of its divisors is an integer number (13368960).

Almost surely, 2^201070021 is an apocalyptic number.

It is an amenable number.

201070021 is a deficient number, since it is larger than the sum of its proper divisors (12833339).

201070021 is a wasteful number, since it uses less digits than its factorization.

201070021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 201070021 is about 14179.9161139973. The cubic root of 201070021 is about 585.8446133685.

The spelling of 201070021 in words is "two hundred one million, seventy thousand, twenty-one".