201000021020 has 24 divisors (see below), whose sum is σ = 422120483568. Its totient is φ = 80396115200.

The previous prime is 201000020959. The next prime is 201000021059. The reversal of 201000021020 is 20120000102.

It is a junction number, because it is equal to n+sod(n) for n = 201000020989 and 201000021007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199700 + ... + 664740.

It is an arithmetic number, because the mean of its divisors is an integer number (17588353482).

Almost surely, 2^201000021020 is an apocalyptic number.

201000021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201000021020 is an abundant number, since it is smaller than the sum of its proper divisors (221120462548).

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

201000021020 is a wasteful number, since it uses less digits than its factorization.

201000021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486661 (or 486659 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 201000021020 its reverse (20120000102), we get a palindrome (221120021122).

The spelling of 201000021020 in words is "two hundred one billion, twenty-one thousand, twenty".