221020220121201 has 64 divisors (see below), whose sum is σ = 333918007234560. Its totient is φ = 144460311652800.

The previous prime is 221020220121191. The next prime is 221020220121229. The reversal of 221020220121201 is 102121022020122.

It is a happy number.

221020220121201 is a `hidden beast` number, since 2 + 210 + 20 + 220 + 1 + 212 + 0 + 1 = 666.

It is not a de Polignac number, because 221020220121201 - 2²¹ = 221020218024049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221020220121901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 661318600 + ... + 661652726.

It is an arithmetic number, because the mean of its divisors is an integer number (5217468863040).

Almost surely, 2^{221020220121201} is an apocalyptic number.

It is an amenable number.

221020220121201 is a deficient number, since it is larger than the sum of its proper divisors (112897787113359).

221020220121201 is a wasteful number, since it uses less digits than its factorization.

221020220121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336611 (or 336605 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221020220121201 its reverse (102121022020122), we get a palindrome (323141242141323).

The spelling of 221020220121201 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty million, one hundred twenty-one thousand, two hundred one".