21149422 has 16 divisors (see below), whose sum is σ = 37236960. Its totient is φ = 8818848.

The previous prime is 21149417. The next prime is 21149449. The reversal of 21149422 is 22494112.

It is a congruent number.

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, 19897 + ... + 20932.

It is an arithmetic number, because the mean of its divisors is an integer number (2327310).

Almost surely, 2^21149422 is an apocalyptic number.

21149422 is a deficient number, since it is larger than the sum of its proper divisors (16087538).

21149422 is a wasteful number, since it uses less digits than its factorization.

21149422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40875.

The product of its digits is 1152, while the sum is 25.

The square root of 21149422 is about 4598.8500736597. The cubic root of 21149422 is about 276.5452272635.

The spelling of 21149422 in words is "twenty-one million, one hundred forty-nine thousand, four hundred twenty-two".