201772539021 has 4 divisors (see below), whose sum is σ = 269030052032. Its totient is φ = 134515026012.

The previous prime is 201772539013. The next prime is 201772539041. The reversal of 201772539021 is 120935277102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201772539021 - 2³ = 201772539013 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 (201772539041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33628756501 + ... + 33628756506.

It is an arithmetic number, because the mean of its divisors is an integer number (67257513008).

Almost surely, 2^201772539021 is an apocalyptic number.

It is an amenable number.

201772539021 is a deficient number, since it is larger than the sum of its proper divisors (67257513011).

201772539021 is an equidigital number, since it uses as much as digits as its factorization.

201772539021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67257513010.

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 201772539021 in words is "two hundred one billion, seven hundred seventy-two million, five hundred thirty-nine thousand, twenty-one".