201022290 has 256 divisors, whose sum is σ = 654704640. Its totient is φ = 42923520.

The previous prime is 201022271. The next prime is 201022301. The reversal of 201022290 is 92220102.

It is a super-2 number, since 2×201022290² = 80819922153688200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2753694 + ... + 2753766.

It is an arithmetic number, because the mean of its divisors is an integer number (2557440).

Almost surely, 2^201022290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201022290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327352320).

201022290 is an abundant number, since it is smaller than the sum of its proper divisors (453682350).

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

201022290 is a wasteful number, since it uses less digits than its factorization.

201022290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 201022290 is about 14178.2329646540. The cubic root of 201022290 is about 585.7982527987.

Adding to 201022290 its reverse (92220102), we get a palindrome (293242392).

The spelling of 201022290 in words is "two hundred one million, twenty-two thousand, two hundred ninety".