201001211111220 has 48 divisors (see below), whose sum is σ = 606095959660800. Its totient is φ = 49477221196416.

The previous prime is 201001211111219. The next prime is 201001211111231. The reversal of 201001211111220 is 22111112100102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 201001211111220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128846929420 + ... + 128846930979.

It is an arithmetic number, because the mean of its divisors is an integer number (12626999159600).

Almost surely, 2^{201001211111220} is an apocalyptic number.

201001211111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201001211111220 is an abundant number, since it is smaller than the sum of its proper divisors (405094748549580).

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

201001211111220 is a wasteful number, since it uses less digits than its factorization.

201001211111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257693860424 (or 257693860422 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201001211111220 its reverse (22111112100102), we get a palindrome (223112323211322).

The spelling of 201001211111220 in words is "two hundred one trillion, one billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty".