21116270 has 64 divisors (see below), whose sum is σ = 46227456. Its totient is φ = 6791040.

The previous prime is 21116267. The next prime is 21116273. The reversal of 21116270 is 7261112.

21116270 is nontrivially palindromic in base 6.

It is an interprime number because it is at equal distance from previous prime (21116267) and next prime (21116273).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80159 + ... + 80421.

It is an arithmetic number, because the mean of its divisors is an integer number (722304).

Almost surely, 2^21116270 is an apocalyptic number.

21116270 is an abundant number, since it is smaller than the sum of its proper divisors (25111186).

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

21116270 is a wasteful number, since it uses less digits than its factorization.

21116270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21116270 is about 4595.2442807755. The cubic root of 21116270 is about 276.4006555917.

Adding to 21116270 its reverse (7261112), we get a palindrome (28377382).

The spelling of 21116270 in words is "twenty-one million, one hundred sixteen thousand, two hundred seventy".