21426926 has 8 divisors (see below), whose sum is σ = 32260680. Its totient is φ = 10673368.

The previous prime is 21426907. The next prime is 21426929. The reversal of 21426926 is 62962412.

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

It is a super-2 number, since 2×21426926² = 918226315618952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21426892 and 21426901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426929) 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, 19376 + ... + 20451.

It is an arithmetic number, because the mean of its divisors is an integer number (4032585).

Almost surely, 2^21426926 is an apocalyptic number.

21426926 is a deficient number, since it is larger than the sum of its proper divisors (10833754).

21426926 is a wasteful number, since it uses less digits than its factorization.

21426926 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40098.

The product of its digits is 10368, while the sum is 32.

The square root of 21426926 is about 4628.9227688524. The cubic root of 21426926 is about 277.7495026271.

The spelling of 21426926 in words is "twenty-one million, four hundred twenty-six thousand, nine hundred twenty-six".