21020220012020 has 24 divisors (see below), whose sum is σ = 45081663346944. Its totient is φ = 8229192514976.

The previous prime is 21020220011981. The next prime is 21020220012031. The reversal of 21020220012020 is 2021002202012.

It is a super-3 number, since 3×21020220012020³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020220011986 and 21020220012004.

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, 11180967152 + ... + 11180969031.

It is an arithmetic number, because the mean of its divisors is an integer number (1878402639456).

Almost surely, 2^{21020220012020} is an apocalyptic number.

21020220012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020220012020 is an abundant number, since it is smaller than the sum of its proper divisors (24061443334924).

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

21020220012020 is a wasteful number, since it uses less digits than its factorization.

21020220012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22361936239 (or 22361936237 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21020220012020 its reverse (2021002202012), we get a palindrome (23041222214032).

The spelling of 21020220012020 in words is "twenty-one trillion, twenty billion, two hundred twenty million, twelve thousand, twenty".