121243244431 has 12 divisors (see below), whose sum is σ = 127239782592. Its totient is φ = 115408584000.

The previous prime is 121243244411. The next prime is 121243244449. The reversal of 121243244431 is 134442342121.

It is a happy number.

It is not a de Polignac number, because 121243244431 - 2¹³ = 121243236239 is a prime.

It is a super-2 number, since 2×121243244431² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121243244393 and 121243244402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121243244411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 410190 + ... + 640891.

It is an arithmetic number, because the mean of its divisors is an integer number (10603315216).

Almost surely, 2^121243244431 is an apocalyptic number.

121243244431 is a deficient number, since it is larger than the sum of its proper divisors (5996538161).

121243244431 is an equidigital number, since it uses as much as digits as its factorization.

121243244431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051234 (or 1051173 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

Adding to 121243244431 its reverse (134442342121), we get a palindrome (255685586552).

The spelling of 121243244431 in words is "one hundred twenty-one billion, two hundred forty-three million, two hundred forty-four thousand, four hundred thirty-one".