221001210021100 has 36 divisors (see below), whose sum is σ = 479575487702584. Its totient is φ = 88399956458880.

The previous prime is 221001210021083. The next prime is 221001210021103. The reversal of 221001210021100 is 1120012100122.

It is not an unprimeable number, because it can be changed into a prime (221001210021103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10465807 + ... + 23484793.

Almost surely, 2^{221001210021100} is an apocalyptic number.

221001210021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001210021100 is an abundant number, since it is smaller than the sum of its proper divisors (258574277681484).

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

221001210021100 is a wasteful number, since it uses less digits than its factorization.

221001210021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13188754 (or 13188747 counting only the distinct ones).

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

Adding to 221001210021100 its reverse (1120012100122), we get a palindrome (222121222121222).

The spelling of 221001210021100 in words is "two hundred twenty-one trillion, one billion, two hundred ten million, twenty-one thousand, one hundred".