20212121101020 has 96 divisors (see below), whose sum is σ = 59925176232768. Its totient is φ = 5072661368832.

The previous prime is 20212121100967. The next prime is 20212121101061. The reversal of 20212121101020 is 2010112121202.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28822474 + ... + 29515406.

It is an arithmetic number, because the mean of its divisors is an integer number (624220585758).

Almost surely, 2^{20212121101020} is an apocalyptic number.

20212121101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212121101020 is an abundant number, since it is smaller than the sum of its proper divisors (39713055131748).

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

20212121101020 is a wasteful number, since it uses less digits than its factorization.

20212121101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721559 (or 721557 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20212121101020 its reverse (2010112121202), we get a palindrome (22222233222222).

The spelling of 20212121101020 in words is "twenty trillion, two hundred twelve billion, one hundred twenty-one million, one hundred one thousand, twenty".