123213421755 has 40 divisors (see below), whose sum is σ = 225570894912. Its totient is φ = 64315648512.

The previous prime is 123213421753. The next prime is 123213421757. The reversal of 123213421755 is 557124312321.

123213421755 is a `hidden beast` number, since 12 + 3 + 213 + 421 + 7 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (123213421753) and next prime (123213421757).

It is not a de Polignac number, because 123213421755 - 2¹ = 123213421753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123213421753) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3217462 + ... + 3255531.

Almost surely, 2^123213421755 is an apocalyptic number.

123213421755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123213421755 is a deficient number, since it is larger than the sum of its proper divisors (102357473157).

123213421755 is an equidigital number, since it uses as much as digits as its factorization.

123213421755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6473057 (or 6473048 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The spelling of 123213421755 in words is "one hundred twenty-three billion, two hundred thirteen million, four hundred twenty-one thousand, seven hundred fifty-five".