1123213031220 has 96 divisors (see below), whose sum is σ = 3599889866496. Its totient is φ = 256333824000.

The previous prime is 1123213031219. The next prime is 1123213031249. The reversal of 1123213031220 is 221303123211.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1816831 + ... + 2355270.

It is an arithmetic number, because the mean of its divisors is an integer number (37498852776).

Almost surely, 2^{1123213031220} is an apocalyptic number.

1123213031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123213031220 is an abundant number, since it is smaller than the sum of its proper divisors (2476676835276).

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

1123213031220 is a wasteful number, since it uses less digits than its factorization.

1123213031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172761 (or 4172759 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1123213031220 its reverse (221303123211), we get a palindrome (1344516154431).

The spelling of 1123213031220 in words is "one trillion, one hundred twenty-three billion, two hundred thirteen million, thirty-one thousand, two hundred twenty".