221012232100 has 72 divisors (see below), whose sum is σ = 524154139488. Its totient is φ = 80220940800.

The previous prime is 221012231983. The next prime is 221012232121. The reversal of 221012232100 is 1232210122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418044 + ... + 785356.

It is an arithmetic number, because the mean of its divisors is an integer number (7279918604).

Almost surely, 2^221012232100 is an apocalyptic number.

221012232100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221012232100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262077069744).

221012232100 is an abundant number, since it is smaller than the sum of its proper divisors (303141907388).

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

221012232100 is a wasteful number, since it uses less digits than its factorization.

221012232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367885 (or 367878 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221012232100 its reverse (1232210122), we get a palindrome (222244442222).

The spelling of 221012232100 in words is "two hundred twenty-one billion, twelve million, two hundred thirty-two thousand, one hundred".