221021001210100 has 216 divisors, whose sum is σ = 627061943244800. Its totient is φ = 65834826209280.

The previous prime is 221021001210029. The next prime is 221021001210223. The reversal of 221021001210100 is 1012100120122.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39390900 + ... + 44650699.

Almost surely, 2^{221021001210100} is an apocalyptic number.

221021001210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021001210100 is an abundant number, since it is smaller than the sum of its proper divisors (406040942034700).

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

221021001210100 is a wasteful number, since it uses less digits than its factorization.

221021001210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84041667 (or 84041643 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221021001210100 its reverse (1012100120122), we get a palindrome (222033101330222).

The spelling of 221021001210100 in words is "two hundred twenty-one trillion, twenty-one billion, one million, two hundred ten thousand, one hundred".