221020001221100 has 72 divisors (see below), whose sum is σ = 491345666166768. Its totient is φ = 86245673011200.

The previous prime is 221020001221099. The next prime is 221020001221133. The reversal of 221020001221100 is 1122100020122.

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, 56944004 + ... + 60701396.

Almost surely, 2^{221020001221100} is an apocalyptic number.

221020001221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020001221100 is an abundant number, since it is smaller than the sum of its proper divisors (270325664945668).

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

221020001221100 is a wasteful number, since it uses less digits than its factorization.

221020001221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3771795 (or 3771788 counting only the distinct ones).

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

Adding to 221020001221100 its reverse (1122100020122), we get a palindrome (222142101241222).

The spelling of 221020001221100 in words is "two hundred twenty-one trillion, twenty billion, one million, two hundred twenty-one thousand, one hundred".