731200122021221 has 8 divisors (see below), whose sum is σ = 750966051373464. Its totient is φ = 711434390768640.

The previous prime is 731200122021209. The next prime is 731200122021247. The reversal of 731200122021221 is 122120221002137.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 717663122500 + 730482458898721 = 847150^2 + 27027439^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 731200122021221 - 2²² = 731200117826917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731200122221221) 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, 42027860 + ... + 56822013.

It is an arithmetic number, because the mean of its divisors is an integer number (93870756421683).

Almost surely, 2^{731200122021221} is an apocalyptic number.

It is an amenable number.

731200122021221 is a deficient number, since it is larger than the sum of its proper divisors (19765929352243).

731200122021221 is a wasteful number, since it uses less digits than its factorization.

731200122021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99049831.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 731200122021221 its reverse (122120221002137), we get a palindrome (853320343023358).

The spelling of 731200122021221 in words is "seven hundred thirty-one trillion, two hundred billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".