1221222231001 has 2 divisors, whose sum is σ = 1221222231002. Its totient is φ = 1221222231000.

The previous prime is 1221222230999. The next prime is 1221222231029. The reversal of 1221222231001 is 1001322221221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1192813465600 + 28408765401 = 1092160^2 + 168549^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221222231001 - 2¹ = 1221222230999 is a prime.

Together with 1221222230999, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221222231001.

It is not a weakly prime, because it can be changed into another prime (1221222231041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611115500 + 610611115501.

It is an arithmetic number, because the mean of its divisors is an integer number (610611115501).

Almost surely, 2^{1221222231001} is an apocalyptic number.

It is an amenable number.

1221222231001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222231001 is an equidigital number, since it uses as much as digits as its factorization.

1221222231001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221222231001 its reverse (1001322221221), we get a palindrome (2222544452222).

It can be divided in two parts, 1221 and 222231001, that added together give a palindrome (222232222).

The spelling of 1221222231001 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, one".