201000202001221 has 16 divisors (see below), whose sum is σ = 232923657519360. Its totient is φ = 169895688163200.

The previous prime is 201000202001177. The next prime is 201000202001231. The reversal of 201000202001221 is 122100202000102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 201000202001221 - 2¹³ = 201000201993029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201000202001231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693873526 + ... + 694163143.

It is an arithmetic number, because the mean of its divisors is an integer number (14557728594960).

Almost surely, 2^{201000202001221} is an apocalyptic number.

It is an amenable number.

201000202001221 is a deficient number, since it is larger than the sum of its proper divisors (31923455518139).

201000202001221 is a wasteful number, since it uses less digits than its factorization.

201000202001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388036964.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 201000202001221 its reverse (122100202000102), we get a palindrome (323100404001323).

The spelling of 201000202001221 in words is "two hundred one trillion, two hundred two million, one thousand, two hundred twenty-one".