20021121210020 has 96 divisors (see below), whose sum is σ = 50581525075200. Its totient is φ = 6502863112704.

The previous prime is 20021121210017. The next prime is 20021121210053. The reversal of 20021121210020 is 2001212112002.

It is a super-3 number, since 3×20021121210020³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20021121209977 and 20021121210004.

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, 81733886 + ... + 81978474.

It is an arithmetic number, because the mean of its divisors is an integer number (526890886200).

Almost surely, 2^{20021121210020} is an apocalyptic number.

20021121210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021121210020 is an abundant number, since it is smaller than the sum of its proper divisors (30560403865180).

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

20021121210020 is a wasteful number, since it uses less digits than its factorization.

20021121210020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275397 (or 275395 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20021121210020 its reverse (2001212112002), we get a palindrome (22022333322022).

The spelling of 20021121210020 in words is "twenty trillion, twenty-one billion, one hundred twenty-one million, two hundred ten thousand, twenty".