21125231514 has 32 divisors (see below), whose sum is σ = 46966942080. Its totient is φ = 7038446400.

The previous prime is 21125231513. The next prime is 21125231527. The reversal of 21125231514 is 41513252112.

It is a happy number.

21125231514 is a `hidden beast` number, since 2 + 1 + 125 + 23 + 1 + 514 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21125231513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26179 + ... + 207209.

It is an arithmetic number, because the mean of its divisors is an integer number (1467716940).

Almost surely, 2^21125231514 is an apocalyptic number.

21125231514 is an abundant number, since it is smaller than the sum of its proper divisors (25841710566).

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

21125231514 is a wasteful number, since it uses less digits than its factorization.

21125231514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183203 (or 183197 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 21125231514 its reverse (41513252112), we get a palindrome (62638483626).

The spelling of 21125231514 in words is "twenty-one billion, one hundred twenty-five million, two hundred thirty-one thousand, five hundred fourteen".