1231222121040 has 80 divisors (see below), whose sum is σ = 3829815376128. Its totient is φ = 327205314048.

The previous prime is 1231222121023. The next prime is 1231222121053. The reversal of 1231222121040 is 401212221321.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1231222121040² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231222120998 and 1231222121016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8684104 + ... + 8824743.

Almost surely, 2^{1231222121040} is an apocalyptic number.

1231222121040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231222121040 is an abundant number, since it is smaller than the sum of its proper divisors (2598593255088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231222121040 is a wasteful number, since it uses less digits than its factorization.

1231222121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509156 (or 17509150 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1231222121040 its reverse (401212221321), we get a palindrome (1632434342361).

The spelling of 1231222121040 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, forty".