201000020122170 has 128 divisors (see below), whose sum is σ = 538622586593280. Its totient is φ = 53337981314880.

The previous prime is 201000020122169. The next prime is 201000020122199. The reversal of 201000020122170 is 71221020000102.

It is a happy number.

It is a super-2 number, since 2×201000020122170² (a number of 29 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125646435 + ... + 127236105.

It is an arithmetic number, because the mean of its divisors is an integer number (4207988957760).

Almost surely, 2^{201000020122170} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201000020122170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269311293296640).

201000020122170 is an abundant number, since it is smaller than the sum of its proper divisors (337622566471110).

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

201000020122170 is a wasteful number, since it uses less digits than its factorization.

201000020122170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591977 (or 1591971 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

Adding to 201000020122170 its reverse (71221020000102), we get a palindrome (272221040122272).

The spelling of 201000020122170 in words is "two hundred one trillion, twenty million, one hundred twenty-two thousand, one hundred seventy".