21125006 has 8 divisors (see below), whose sum is σ = 36214320. Its totient is φ = 9053568.

The previous prime is 21125003. The next prime is 21125029. The reversal of 21125006 is 60052112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754451 + ... + 754478.

It is an arithmetic number, because the mean of its divisors is an integer number (4526790).

Almost surely, 2^21125006 is an apocalyptic number.

21125006 is a deficient number, since it is larger than the sum of its proper divisors (15089314).

21125006 is a wasteful number, since it uses less digits than its factorization.

21125006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508938.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21125006 is about 4596.1947304265. The cubic root of 21125006 is about 276.4387668557.

Adding to 21125006 its reverse (60052112), we get a palindrome (81177118).

The spelling of 21125006 in words is "twenty-one million, one hundred twenty-five thousand, six".