21221001120220 has 48 divisors (see below), whose sum is σ = 48616087943808. Its totient is φ = 7716616004160.

The previous prime is 21221001120149. The next prime is 21221001120271. The reversal of 21221001120220 is 2202110012212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21221001120194 and 21221001120203.

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, 15378019 + ... + 16701061.

It is an arithmetic number, because the mean of its divisors is an integer number (1012835165496).

Almost surely, 2^{21221001120220} is an apocalyptic number.

21221001120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221001120220 is an abundant number, since it is smaller than the sum of its proper divisors (27395086823588).

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

21221001120220 is a wasteful number, since it uses less digits than its factorization.

21221001120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395970 (or 1395968 counting only the distinct ones).

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

Adding to 21221001120220 its reverse (2202110012212), we get a palindrome (23423111132432).

The spelling of 21221001120220 in words is "twenty-one trillion, two hundred twenty-one billion, one million, one hundred twenty thousand, two hundred twenty".