21740106 has 32 divisors (see below), whose sum is σ = 45619200. Its totient is φ = 6893744.

The previous prime is 21740101. The next prime is 21740137. The reversal of 21740106 is 60104712.

It is a super-3 number, since 3×21740106³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21740101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35995 + ... + 36593.

It is an arithmetic number, because the mean of its divisors is an integer number (1425600).

Almost surely, 2^21740106 is an apocalyptic number.

21740106 is an abundant number, since it is smaller than the sum of its proper divisors (23879094).

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

21740106 is a wasteful number, since it uses less digits than its factorization.

21740106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

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

The square root of 21740106 is about 4662.6286577423. The cubic root of 21740106 is about 279.0961757816.

Adding to 21740106 its reverse (60104712), we get a palindrome (81844818).

The spelling of 21740106 in words is "twenty-one million, seven hundred forty thousand, one hundred six".