123211110100 has 72 divisors (see below), whose sum is σ = 292815321120. Its totient is φ = 44722231680.

The previous prime is 123211110091. The next prime is 123211110161. The reversal of 123211110100 is 1011112321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 726502 + ... + 879901.

It is an arithmetic number, because the mean of its divisors is an integer number (4066879460).

Almost surely, 2^123211110100 is an apocalyptic number.

123211110100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123211110100 is an abundant number, since it is smaller than the sum of its proper divisors (169604211020).

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

123211110100 is a wasteful number, since it uses less digits than its factorization.

123211110100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606489 (or 1606482 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 123211110100 its reverse (1011112321), we get a palindrome (124222222421).

The spelling of 123211110100 in words is "one hundred twenty-three billion, two hundred eleven million, one hundred ten thousand, one hundred".