221201211220100 has 72 divisors (see below), whose sum is σ = 486088692082560. Its totient is φ = 87359394545280.

The previous prime is 221201211220037. The next prime is 221201211220111. The reversal of 221201211220100 is 1022112102122.

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, 1004240579 + ... + 1004460821.

It is an arithmetic number, because the mean of its divisors is an integer number (6751231834480).

Almost surely, 2^{221201211220100} is an apocalyptic number.

221201211220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201211220100 is an abundant number, since it is smaller than the sum of its proper divisors (264887480862460).

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

221201211220100 is a wasteful number, since it uses less digits than its factorization.

221201211220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347469 (or 347462 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221201211220100 its reverse (1022112102122), we get a palindrome (222223323322222).

The spelling of 221201211220100 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred eleven million, two hundred twenty thousand, one hundred".