201021022121020 has 12 divisors (see below), whose sum is σ = 422144146454184. Its totient is φ = 80408408848400.

The previous prime is 201021022120991. The next prime is 201021022121071. The reversal of 201021022121020 is 20121220120102.

It is a happy number.

It is a super-2 number, since 2×201021022121020² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201021022120985 and 201021022121003.

It is a congruent number.

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, 5025525553006 + ... + 5025525553045.

It is an arithmetic number, because the mean of its divisors is an integer number (35178678871182).

Almost surely, 2^{201021022121020} is an apocalyptic number.

201021022121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021022121020 is an abundant number, since it is smaller than the sum of its proper divisors (221123124333164).

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

201021022121020 is a wasteful number, since it uses less digits than its factorization.

201021022121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10051051106060 (or 10051051106058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201021022121020 its reverse (20121220120102), we get a palindrome (221142242241122).

The spelling of 201021022121020 in words is "two hundred one trillion, twenty-one billion, twenty-two million, one hundred twenty-one thousand, twenty".