21695061 has 16 divisors (see below), whose sum is σ = 29868608. Its totient is φ = 13996800.

The previous prime is 21695057. The next prime is 21695081. The reversal of 21695061 is 16059612.

It is not a de Polignac number, because 21695061 - 2² = 21695057 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21695021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26346 + ... + 27156.

It is an arithmetic number, because the mean of its divisors is an integer number (1866788).

Almost surely, 2^21695061 is an apocalyptic number.

It is an amenable number.

21695061 is a deficient number, since it is larger than the sum of its proper divisors (8173547).

21695061 is a wasteful number, since it uses less digits than its factorization.

21695061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21695061 is about 4657.7957233009. The cubic root of 21695061 is about 278.9032822092.

The spelling of 21695061 in words is "twenty-one million, six hundred ninety-five thousand, sixty-one".