201001211121220 has 12 divisors (see below), whose sum is σ = 422102543354604. Its totient is φ = 80400484448480.

The previous prime is 201001211121203. The next prime is 201001211121257. The reversal of 201001211121220 is 22121112100102.

It can be written as a sum of positive squares in 2 ways, for example, as 152746265211136 + 48254945910084 = 12359056^2 + 6946578^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201001211121194 and 201001211121203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025030278011 + ... + 5025030278050.

It is an arithmetic number, because the mean of its divisors is an integer number (35175211946217).

Almost surely, 2^{201001211121220} is an apocalyptic number.

201001211121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201001211121220 is an abundant number, since it is smaller than the sum of its proper divisors (221101332233384).

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

201001211121220 is a wasteful number, since it uses less digits than its factorization.

201001211121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050060556070 (or 10050060556068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201001211121220 its reverse (22121112100102), we get a palindrome (223122323221322).

The spelling of 201001211121220 in words is "two hundred one trillion, one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty".