21070116 has 36 divisors (see below), whose sum is σ = 55578432. Its totient is φ = 6717744.

The previous prime is 21070103. The next prime is 21070117. The reversal of 21070116 is 61107012.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11896 + ... + 13551.

Almost surely, 2^21070116 is an apocalyptic number.

It is an amenable number.

21070116 is an abundant number, since it is smaller than the sum of its proper divisors (34508316).

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

21070116 is a wasteful number, since it uses less digits than its factorization.

21070116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25480 (or 25475 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 21070116 is about 4590.2196025898. The cubic root of 21070116 is about 276.1991316560.

Adding to 21070116 its reverse (61107012), we get a palindrome (82177128).

The spelling of 21070116 in words is "twenty-one million, seventy thousand, one hundred sixteen".