21106074 has 32 divisors (see below), whose sum is σ = 48476160. Its totient is φ = 6058800.

The previous prime is 21106067. The next prime is 21106079. The reversal of 21106074 is 47060112.

It is a self number, because there is not a number n which added to its sum of digits gives 21106074.

It is not an unprimeable number, because it can be changed into a prime (21106079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7162 + ... + 9669.

It is an arithmetic number, because the mean of its divisors is an integer number (1514880).

Almost surely, 2^21106074 is an apocalyptic number.

21106074 is an abundant number, since it is smaller than the sum of its proper divisors (27370086).

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

21106074 is a wasteful number, since it uses less digits than its factorization.

21106074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16866.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 21106074 is about 4594.1347389906. The cubic root of 21106074 is about 276.3561617047.

Adding to 21106074 its reverse (47060112), we get a palindrome (68166186).

The spelling of 21106074 in words is "twenty-one million, one hundred six thousand, seventy-four".