201221561453 has 8 divisors (see below), whose sum is σ = 219521340000. Its totient is φ = 182922934480.

The previous prime is 201221561419. The next prime is 201221561501. The reversal of 201221561453 is 354165122102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201221561453 - 2²⁰ = 201220512877 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 (201221560453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100226 + ... + 642252.

It is an arithmetic number, because the mean of its divisors is an integer number (27440167500).

Almost surely, 2^201221561453 is an apocalyptic number.

It is an amenable number.

201221561453 is a deficient number, since it is larger than the sum of its proper divisors (18299778547).

201221561453 is a wasteful number, since it uses less digits than its factorization.

201221561453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575787.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 201221561453 its reverse (354165122102), we get a palindrome (555386683555).

The spelling of 201221561453 in words is "two hundred one billion, two hundred twenty-one million, five hundred sixty-one thousand, four hundred fifty-three".