21125426 has 8 divisors (see below), whose sum is σ = 36215040. Its totient is φ = 9053748.

The previous prime is 21125393. The next prime is 21125443. The reversal of 21125426 is 62452112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754466 + ... + 754493.

It is an arithmetic number, because the mean of its divisors is an integer number (4526880).

Almost surely, 2^21125426 is an apocalyptic number.

21125426 is a deficient number, since it is larger than the sum of its proper divisors (15089614).

21125426 is a wasteful number, since it uses less digits than its factorization.

21125426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508968.

The product of its digits is 960, while the sum is 23.

The square root of 21125426 is about 4596.2404201695. The cubic root of 21125426 is about 276.4405988632.

Adding to 21125426 its reverse (62452112), we get a palindrome (83577538).

The spelling of 21125426 in words is "twenty-one million, one hundred twenty-five thousand, four hundred twenty-six".