21106426 has 8 divisors (see below), whose sum is σ = 34537824. Its totient is φ = 9593820.

The previous prime is 21106411. The next prime is 21106429. The reversal of 21106426 is 62460112.

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

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 959383 = 21106426 / (2 + 1 + 1 + 0 + 6 + 4 + 2 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 21106397 and 21106406.

It is not an unprimeable number, because it can be changed into a prime (21106429) 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, 479670 + ... + 479713.

It is an arithmetic number, because the mean of its divisors is an integer number (4317228).

Almost surely, 2^21106426 is an apocalyptic number.

21106426 is a deficient number, since it is larger than the sum of its proper divisors (13431398).

21106426 is a wasteful number, since it uses less digits than its factorization.

21106426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959396.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21106426 is about 4594.1730485475. The cubic root of 21106426 is about 276.3576980212.

Adding to 21106426 its reverse (62460112), we get a palindrome (83566538).

The spelling of 21106426 in words is "twenty-one million, one hundred six thousand, four hundred twenty-six".