201001221101020 has 48 divisors (see below), whose sum is σ = 426860191140768. Its totient is φ = 79498705178880.

The previous prime is 201001221101011. The next prime is 201001221101027. The reversal of 201001221101020 is 20101122100102.

It is a super-2 number, since 2×201001221101020² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201001221101027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137754447 + ... + 139205926.

It is an arithmetic number, because the mean of its divisors is an integer number (8892920648766).

Almost surely, 2^{201001221101020} is an apocalyptic number.

201001221101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201001221101020 is an abundant number, since it is smaller than the sum of its proper divisors (225858970039748).

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

201001221101020 is a wasteful number, since it uses less digits than its factorization.

201001221101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276960790 (or 276960788 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201001221101020 its reverse (20101122100102), we get a palindrome (221102343201122).

The spelling of 201001221101020 in words is "two hundred one trillion, one billion, two hundred twenty-one million, one hundred one thousand, twenty".