1221234140431 has 2 divisors, whose sum is σ = 1221234140432. Its totient is φ = 1221234140430.

The previous prime is 1221234140419. The next prime is 1221234140449. The reversal of 1221234140431 is 1340414321221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221234140431 - 2¹⁵ = 1221234107663 is a prime.

It is a super-2 number, since 2×1221234140431² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221234140431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221234140491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610617070215 + 610617070216.

It is an arithmetic number, because the mean of its divisors is an integer number (610617070216).

Almost surely, 2^{1221234140431} is an apocalyptic number.

1221234140431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221234140431 is an equidigital number, since it uses as much as digits as its factorization.

1221234140431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1221234140431 its reverse (1340414321221), we get a palindrome (2561648461652).

The spelling of 1221234140431 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-four million, one hundred forty thousand, four hundred thirty-one".