21070110 has 16 divisors (see below), whose sum is σ = 50568336. Its totient is φ = 5618688.

The previous prime is 21070103. The next prime is 21070117. The reversal of 21070110 is 1107012.

It is an interprime number because it is at equal distance from previous prime (21070103) and next prime (21070117).

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351139 + ... + 351198.

It is an arithmetic number, because the mean of its divisors is an integer number (3160521).

Almost surely, 2^21070110 is an apocalyptic number.

21070110 is an abundant number, since it is smaller than the sum of its proper divisors (29498226).

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

21070110 is a wasteful number, since it uses less digits than its factorization.

21070110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702347.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 21070110 is about 4590.2189490263. The cubic root of 21070110 is about 276.1991054388.

Adding to 21070110 its reverse (1107012), we get a palindrome (22177122).

The spelling of 21070110 in words is "twenty-one million, seventy thousand, one hundred ten".