123919312221 has 12 divisors (see below), whose sum is σ = 179005383648. Its totient is φ = 82607880264.

The previous prime is 123919312213. The next prime is 123919312249. The reversal of 123919312221 is 122213919321.

123919312221 is a `hidden beast` number, since 1 + 239 + 193 + 12 + 221 = 666.

It is not a de Polignac number, because 123919312221 - 2³ = 123919312213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123919312201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255825 + ... + 559718.

It is an arithmetic number, because the mean of its divisors is an integer number (14917115304).

Almost surely, 2^123919312221 is an apocalyptic number.

It is an amenable number.

123919312221 is a deficient number, since it is larger than the sum of its proper divisors (55086071427).

123919312221 is a wasteful number, since it uses less digits than its factorization.

123919312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832432 (or 832429 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The spelling of 123919312221 in words is "one hundred twenty-three billion, nine hundred nineteen million, three hundred twelve thousand, two hundred twenty-one".