123121010000 has 50 divisors (see below), whose sum is σ = 298088301522. Its totient is φ = 49248400000.

The previous prime is 123121009981. The next prime is 123121010003. The reversal of 123121010000 is 10121321.

It can be written as a sum of positive squares in 5 ways, for example, as 63119527696 + 60001482304 = 251236^2 + 244952^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121010003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6146051 + ... + 6166050.

Almost surely, 2^123121010000 is an apocalyptic number.

123121010000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121010000 is an abundant number, since it is smaller than the sum of its proper divisors (174967291522).

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

123121010000 is an equidigital number, since it uses as much as digits as its factorization.

123121010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312129 (or 12312108 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 123121010000 its reverse (10121321), we get a palindrome (123131131321).

The spelling of 123121010000 in words is "one hundred twenty-three billion, one hundred twenty-one million, ten thousand".