21422546 has 16 divisors (see below), whose sum is σ = 33151680. Its totient is φ = 10377360.

The previous prime is 21422537. The next prime is 21422551. The reversal of 21422546 is 64522412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7100 + ... + 9656.

It is an arithmetic number, because the mean of its divisors is an integer number (2071980).

Almost surely, 2^21422546 is an apocalyptic number.

21422546 is a deficient number, since it is larger than the sum of its proper divisors (11729134).

21422546 is a wasteful number, since it uses less digits than its factorization.

21422546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689.

The product of its digits is 3840, while the sum is 26.

The square root of 21422546 is about 4628.4496324363. The cubic root of 21422546 is about 277.7305758848.

Adding to 21422546 its reverse (64522412), we get a palindrome (85944958).

The spelling of 21422546 in words is "twenty-one million, four hundred twenty-two thousand, five hundred forty-six".