21770106 has 8 divisors (see below), whose sum is σ = 43540224. Its totient is φ = 7256700.

The previous prime is 21770093. The next prime is 21770129. The reversal of 21770106 is 60107712.

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

21770106 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814170 + ... + 1814181.

It is an arithmetic number, because the mean of its divisors is an integer number (5442528).

Almost surely, 2^21770106 is an apocalyptic number.

21770106 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21770106 is a wasteful number, since it uses less digits than its factorization.

21770106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628356.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 21770106 is about 4665.8446180729. The cubic root of 21770106 is about 279.2244952551.

Adding to 21770106 its reverse (60107712), we get a palindrome (81877818).

The spelling of 21770106 in words is "twenty-one million, seven hundred seventy thousand, one hundred six".