1221103131000 has 64 divisors (see below), whose sum is σ = 3809841778080. Its totient is φ = 325627500800.

The previous prime is 1221103130987. The next prime is 1221103131043. The reversal of 1221103131000 is 1313011221.

It is a happy number.

It is a super-2 number, since 2×1221103131000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 203514189 + ... + 203520188.

Almost surely, 2^{1221103131000} is an apocalyptic number.

1221103131000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221103131000 is an abundant number, since it is smaller than the sum of its proper divisors (2588738647080).

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

1221103131000 is a wasteful number, since it uses less digits than its factorization.

1221103131000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407034401 (or 407034387 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1221103131000 its reverse (1313011221), we get a palindrome (1222416142221).

The spelling of 1221103131000 in words is "one trillion, two hundred twenty-one billion, one hundred three million, one hundred thirty-one thousand".