21031123123010 has 128 divisors (see below), whose sum is σ = 50829931482624. Its totient is φ = 6050642780160.

The previous prime is 21031123122953. The next prime is 21031123123027. The reversal of 21031123123010 is 1032132113012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 372513944 + ... + 372570396.

It is an arithmetic number, because the mean of its divisors is an integer number (397108839708).

Almost surely, 2^{21031123123010} is an apocalyptic number.

21031123123010 is an abundant number, since it is smaller than the sum of its proper divisors (29798808359614).

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

21031123123010 is a wasteful number, since it uses less digits than its factorization.

21031123123010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93708.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21031123123010 its reverse (1032132113012), we get a palindrome (22063255236022).

The spelling of 21031123123010 in words is "twenty-one trillion, thirty-one billion, one hundred twenty-three million, one hundred twenty-three thousand, ten".