221422011231261 has 4 divisors (see below), whose sum is σ = 295229348308352. Its totient is φ = 147614674154172.

The previous prime is 221422011231233. The next prime is 221422011231263. The reversal of 221422011231261 is 162132110224122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221422011231261 - 2⁴³ = 212625918209053 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 (221422011231263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36903668538541 + ... + 36903668538546.

It is an arithmetic number, because the mean of its divisors is an integer number (73807337077088).

Almost surely, 2^{221422011231261} is an apocalyptic number.

It is an amenable number.

221422011231261 is a deficient number, since it is larger than the sum of its proper divisors (73807337077091).

221422011231261 is an equidigital number, since it uses as much as digits as its factorization.

221422011231261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73807337077090.

The product of its (nonzero) digits is 4608, while the sum is 30.

Adding to 221422011231261 its reverse (162132110224122), we get a palindrome (383554121455383).

The spelling of 221422011231261 in words is "two hundred twenty-one trillion, four hundred twenty-two billion, eleven million, two hundred thirty-one thousand, two hundred sixty-one".