21106626 has 16 divisors (see below), whose sum is σ = 42284064. Its totient is φ = 7023744.

The previous prime is 21106607. The next prime is 21106643. The reversal of 21106626 is 62660112.

It is a super-2 number, since 2×21106626² = 890979322207752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21106596 and 21106605.

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, 1425 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (2642754).

Almost surely, 2^21106626 is an apocalyptic number.

21106626 is an abundant number, since it is smaller than the sum of its proper divisors (21177438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21106626 is a wasteful number, since it uses less digits than its factorization.

21106626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21106626 is about 4594.1948151989. The cubic root of 21106626 is about 276.3585709207.

Adding to 21106626 its reverse (62660112), we get a palindrome (83766738).

The spelling of 21106626 in words is "twenty-one million, one hundred six thousand, six hundred twenty-six".