21154426 has 8 divisors (see below), whose sum is σ = 33598260. Its totient is φ = 9955008.

The previous prime is 21154403. The next prime is 21154447. The reversal of 21154426 is 62445112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 40401 = 4595^2 + 201^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21154426.

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, 311061 + ... + 311128.

Almost surely, 2^21154426 is an apocalyptic number.

21154426 is a deficient number, since it is larger than the sum of its proper divisors (12443834).

21154426 is a wasteful number, since it uses less digits than its factorization.

21154426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622208.

The product of its digits is 1920, while the sum is 25.

The square root of 21154426 is about 4599.3940905298. The cubic root of 21154426 is about 276.5670359476.

Adding to 21154426 its reverse (62445112), we get a palindrome (83599538).

The spelling of 21154426 in words is "twenty-one million, one hundred fifty-four thousand, four hundred twenty-six".