21020221012120 has 64 divisors (see below), whose sum is σ = 52105930503840. Its totient is φ = 7568036352000.

The previous prime is 21020221012097. The next prime is 21020221012157. The reversal of 21020221012120 is 2121012202012.

It is a happy number.

It is a super-3 number, since 3×21020221012120³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21020221012094 and 21020221012103.

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, 236456697 + ... + 236545576.

Almost surely, 2^{21020221012120} is an apocalyptic number.

21020221012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020221012120 is an abundant number, since it is smaller than the sum of its proper divisors (31085709491720).

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

21020221012120 is a wasteful number, since it uses less digits than its factorization.

21020221012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473002396 (or 473002392 counting only the distinct ones).

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

Adding to 21020221012120 its reverse (2121012202012), we get a palindrome (23141233214132).

The spelling of 21020221012120 in words is "twenty-one trillion, twenty billion, two hundred twenty-one million, twelve thousand, one hundred twenty".