221021100020120 has 64 divisors (see below), whose sum is σ = 511828555795200. Its totient is φ = 85862306597760.

The previous prime is 221021100020087. The next prime is 221021100020143. The reversal of 221021100020120 is 21020001120122.

It is a junction number, because it is equal to n+sod(n) for n = 221021100020095 and 221021100020104.

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, 580588310 + ... + 580968869.

It is an arithmetic number, because the mean of its divisors is an integer number (7997321184300).

Almost surely, 2^{221021100020120} is an apocalyptic number.

221021100020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021100020120 is an abundant number, since it is smaller than the sum of its proper divisors (290807455775080).

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

221021100020120 is a wasteful number, since it uses less digits than its factorization.

221021100020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161557328 (or 1161557324 counting only the distinct ones).

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

Adding to 221021100020120 its reverse (21020001120122), we get a palindrome (242041101140242).

The spelling of 221021100020120 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred million, twenty thousand, one hundred twenty".