201621611250 has 240 divisors, whose sum is σ = 575806682880. Its totient is φ = 50830416000.

The previous prime is 201621611221. The next prime is 201621611251. The reversal of 201621611250 is 52116126102.

201621611250 is a `hidden beast` number, since 2 + 0 + 1 + 6 + 21 + 611 + 25 + 0 = 666.

It is a super-2 number, since 2×201621611250² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201621611251) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 184465704 + ... + 184466796.

It is an arithmetic number, because the mean of its divisors is an integer number (2399194512).

Almost surely, 2^201621611250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201621611250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287903341440).

201621611250 is an abundant number, since it is smaller than the sum of its proper divisors (374185071630).

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

201621611250 is a wasteful number, since it uses less digits than its factorization.

201621611250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003 (or 1985 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 201621611250 its reverse (52116126102), we get a palindrome (253737737352).

The spelling of 201621611250 in words is "two hundred one billion, six hundred twenty-one million, six hundred eleven thousand, two hundred fifty".