1221230023123 has 8 divisors (see below), whose sum is σ = 1332869748336. Its totient is φ = 1109693433600.

The previous prime is 1221230023037. The next prime is 1221230023133. The reversal of 1221230023123 is 3213200321221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221230023123 is a prime.

It is a super-2 number, since 2×1221230023123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221230023094 and 1221230023103.

It is not an unprimeable number, because it can be changed into a prime (1221230023133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25759158 + ... + 25806523.

It is an arithmetic number, because the mean of its divisors is an integer number (166608718542).

Almost surely, 2^{1221230023123} is an apocalyptic number.

1221230023123 is a deficient number, since it is larger than the sum of its proper divisors (111639725213).

1221230023123 is a wasteful number, since it uses less digits than its factorization.

1221230023123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51567845.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1221230023123 its reverse (3213200321221), we get a palindrome (4434430344344).

The spelling of 1221230023123 in words is "one trillion, two hundred twenty-one billion, two hundred thirty million, twenty-three thousand, one hundred twenty-three".