201012021090 has 160 divisors (see below), whose sum is σ = 549704182896. Its totient is φ = 52695152640.

The previous prime is 201012021053. The next prime is 201012021101. The reversal of 201012021090 is 90120210102.

It can be written as a sum of positive squares in 8 ways, for example, as 22592795481 + 178419225609 = 150309^2 + 422397^2 .

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 79 ways as a sum of consecutive naturals, for example, 18502260 + ... + 18513120.

Almost surely, 2^201012021090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201012021090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274852091448).

201012021090 is an abundant number, since it is smaller than the sum of its proper divisors (348692161806).

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

201012021090 is a wasteful number, since it uses less digits than its factorization.

201012021090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11266 (or 11257 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 201012021090 its reverse (90120210102), we get a palindrome (291132231192).

The spelling of 201012021090 in words is "two hundred one billion, twelve million, twenty-one thousand, ninety".