1220220312123 has 32 divisors (see below), whose sum is σ = 1823509670400. Its totient is φ = 722036077056.

The previous prime is 1220220312067. The next prime is 1220220312133. The reversal of 1220220312123 is 3212130220221.

It is not a de Polignac number, because 1220220312123 - 2⁸ = 1220220311867 is a prime.

It is a super-2 number, since 2×1220220312123² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1220220312123.

It is not an unprimeable number, because it can be changed into a prime (1220220312133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9529783 + ... + 9656976.

It is an arithmetic number, because the mean of its divisors is an integer number (56984677200).

Almost surely, 2^{1220220312123} is an apocalyptic number.

1220220312123 is a deficient number, since it is larger than the sum of its proper divisors (603289358277).

1220220312123 is a wasteful number, since it uses less digits than its factorization.

1220220312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19186851.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1220220312123 its reverse (3212130220221), we get a palindrome (4432350532344).

The spelling of 1220220312123 in words is "one trillion, two hundred twenty billion, two hundred twenty million, three hundred twelve thousand, one hundred twenty-three".