220750721261 has 8 divisors (see below), whose sum is σ = 252292213440. Its totient is φ = 189210647808.

The previous prime is 220750721227. The next prime is 220750721309. The reversal of 220750721261 is 162127057022.

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

It is not a de Polignac number, because 220750721261 - 2¹⁸ = 220750459117 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 (220750721201) 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, 2765 + ... + 664461.

It is an arithmetic number, because the mean of its divisors is an integer number (31536526680).

Almost surely, 2^220750721261 is an apocalyptic number.

It is an amenable number.

220750721261 is a deficient number, since it is larger than the sum of its proper divisors (31541492179).

220750721261 is an equidigital number, since it uses as much as digits as its factorization.

220750721261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709363.

The product of its (nonzero) digits is 23520, while the sum is 35.

Adding to 220750721261 its reverse (162127057022), we get a palindrome (382877778283).

The spelling of 220750721261 in words is "two hundred twenty billion, seven hundred fifty million, seven hundred twenty-one thousand, two hundred sixty-one".