201850021720 has 32 divisors (see below), whose sum is σ = 454326343200. Its totient is φ = 80710889728.

The previous prime is 201850021673. The next prime is 201850021721. The reversal of 201850021720 is 27120058102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201850021721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797500 + ... + 1019659.

It is an arithmetic number, because the mean of its divisors is an integer number (14197698225).

Almost surely, 2^201850021720 is an apocalyptic number.

201850021720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201850021720 is an abundant number, since it is smaller than the sum of its proper divisors (252476321480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201850021720 is a wasteful number, since it uses less digits than its factorization.

201850021720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819947 (or 1819943 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 201850021720 its reverse (27120058102), we get a palindrome (228970079822).

The spelling of 201850021720 in words is "two hundred one billion, eight hundred fifty million, twenty-one thousand, seven hundred twenty".