201021221020 has 48 divisors (see below), whose sum is σ = 429599858688. Its totient is φ = 79000729920.

The previous prime is 201021220993. The next prime is 201021221161. The reversal of 201021221020 is 20122120102.

It is a happy number.

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, 122566 + ... + 645805.

It is an arithmetic number, because the mean of its divisors is an integer number (8949997056).

Almost surely, 2^201021221020 is an apocalyptic number.

201021221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201021221020 is an abundant number, since it is smaller than the sum of its proper divisors (228578637668).

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

201021221020 is a wasteful number, since it uses less digits than its factorization.

201021221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768610 (or 768608 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201021221020 its reverse (20122120102), we get a palindrome (221143341122).

The spelling of 201021221020 in words is "two hundred one billion, twenty-one million, two hundred twenty-one thousand, twenty".