123202012212 has 18 divisors (see below), whose sum is σ = 311427308738. Its totient is φ = 41067337392.

The previous prime is 123202012177. The next prime is 123202012343. The reversal of 123202012212 is 212210202321.

It can be written as a sum of positive squares in only one way, i.e., 97947717156 + 25254295056 = 312966^2 + 158916^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×123202012212³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1711139023 + ... + 1711139094.

Almost surely, 2^123202012212 is an apocalyptic number.

123202012212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123202012212 is an abundant number, since it is smaller than the sum of its proper divisors (188225296526).

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

123202012212 is a wasteful number, since it uses less digits than its factorization.

123202012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422278127 (or 3422278122 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 123202012212 its reverse (212210202321), we get a palindrome (335412214533).

The spelling of 123202012212 in words is "one hundred twenty-three billion, two hundred two million, twelve thousand, two hundred twelve".