21010123425 has 48 divisors (see below), whose sum is σ = 34907640768. Its totient is φ = 11150438400.

The previous prime is 21010123397. The next prime is 21010123439. The reversal of 21010123425 is 52432101012.

It is not a de Polignac number, because 21010123425 - 2⁶ = 21010123361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19257130 + ... + 19258220.

It is an arithmetic number, because the mean of its divisors is an integer number (727242516).

Almost surely, 2^21010123425 is an apocalyptic number.

21010123425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21010123425 is a deficient number, since it is larger than the sum of its proper divisors (13897517343).

21010123425 is a wasteful number, since it uses less digits than its factorization.

21010123425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130 (or 2125 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21010123425 its reverse (52432101012), we get a palindrome (73442224437).

The spelling of 21010123425 in words is "twenty-one billion, ten million, one hundred twenty-three thousand, four hundred twenty-five".