221530837898100 has 72 divisors (see below), whose sum is σ = 641128484525760. Its totient is φ = 59059597306880.

The previous prime is 221530837898023. The next prime is 221530837898107. The reversal of 221530837898100 is 1898738035122.

It is a super-2 number, since 2×221530837898100² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221530837898107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94419165 + ... + 96736964.

It is an arithmetic number, because the mean of its divisors is an integer number (8904562285080).

Almost surely, 2^{221530837898100} is an apocalyptic number.

221530837898100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221530837898100 is an abundant number, since it is smaller than the sum of its proper divisors (419597646627660).

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

221530837898100 is a wasteful number, since it uses less digits than its factorization.

221530837898100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191160009 (or 191160002 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 221530837898100 in words is "two hundred twenty-one trillion, five hundred thirty billion, eight hundred thirty-seven million, eight hundred ninety-eight thousand, one hundred".