201872021 has 12 divisors (see below), whose sum is σ = 219512160. Its totient is φ = 185562000.

The previous prime is 201872009. The next prime is 201872039. The reversal of 201872021 is 120278102.

It is not a de Polignac number, because 201872021 - 2²⁶ = 134763157 is a prime.

It is a super-4 number, since 4×201872021⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201872221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40040 + ... + 44798.

It is an arithmetic number, because the mean of its divisors is an integer number (18292680).

Almost surely, 2^201872021 is an apocalyptic number.

It is an amenable number.

201872021 is a deficient number, since it is larger than the sum of its proper divisors (17640139).

201872021 is a wasteful number, since it uses less digits than its factorization.

201872021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5036 (or 5023 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 201872021 is about 14208.1674047007. The cubic root of 201872021 is about 586.6224917596.

The spelling of 201872021 in words is "two hundred one million, eight hundred seventy-two thousand, twenty-one".