21425011 has 4 divisors (see below), whose sum is σ = 21518800. Its totient is φ = 21331224.

The previous prime is 21425009. The next prime is 21425021. The reversal of 21425011 is 11052412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21425011 - 2¹ = 21425009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21425021) 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, 46551 + ... + 47008.

It is an arithmetic number, because the mean of its divisors is an integer number (5379700).

Almost surely, 2^21425011 is an apocalyptic number.

21425011 is a deficient number, since it is larger than the sum of its proper divisors (93789).

21425011 is an equidigital number, since it uses as much as digits as its factorization.

21425011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93788.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21425011 is about 4628.7159126479. The cubic root of 21425011 is about 277.7412278962.

Adding to 21425011 its reverse (11052412), we get a palindrome (32477423).

The spelling of 21425011 in words is "twenty-one million, four hundred twenty-five thousand, eleven".