21002101212220 has 12 divisors (see below), whose sum is σ = 44104412545704. Its totient is φ = 8400840484880.

The previous prime is 21002101212203. The next prime is 21002101212233. The reversal of 21002101212220 is 2221210120012.

It is a happy number.

It is a super-3 number, since 3×21002101212220³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002101212194 and 21002101212203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525052530286 + ... + 525052530325.

It is an arithmetic number, because the mean of its divisors is an integer number (3675367712142).

Almost surely, 2^{21002101212220} is an apocalyptic number.

21002101212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002101212220 is an abundant number, since it is smaller than the sum of its proper divisors (23102311333484).

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

21002101212220 is a wasteful number, since it uses less digits than its factorization.

21002101212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050105060620 (or 1050105060618 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21002101212220 its reverse (2221210120012), we get a palindrome (23223311332232).

The spelling of 21002101212220 in words is "twenty-one trillion, two billion, one hundred one million, two hundred twelve thousand, two hundred twenty".