1221123310000 has 100 divisors (see below), whose sum is σ = 3225231176904. Its totient is φ = 444044800000.

The previous prime is 1221123309983. The next prime is 1221123310013. The reversal of 1221123310000 is 133211221.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×1221123310000² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5440561 + ... + 5660560.

Almost surely, 2^{1221123310000} is an apocalyptic number.

1221123310000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221123310000 is an abundant number, since it is smaller than the sum of its proper divisors (2004107866904).

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

1221123310000 is a wasteful number, since it uses less digits than its factorization.

1221123310000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101160 (or 11101139 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1221123310000 its reverse (133211221), we get a palindrome (1221256521221).

The spelling of 1221123310000 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-three million, three hundred ten thousand".