21070734 has 16 divisors (see below), whose sum is σ = 44359680. Its totient is φ = 6653880.

The previous prime is 21070727. The next prime is 21070739. The reversal of 21070734 is 43707012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070739) 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, 92302 + ... + 92529.

It is an arithmetic number, because the mean of its divisors is an integer number (2772480).

Almost surely, 2^21070734 is an apocalyptic number.

21070734 is an abundant number, since it is smaller than the sum of its proper divisors (23288946).

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

21070734 is a wasteful number, since it uses less digits than its factorization.

21070734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184855.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 21070734 is about 4590.2869191370. The cubic root of 21070734 is about 276.2018319954.

Adding to 21070734 its reverse (43707012), we get a palindrome (64777746).

The spelling of 21070734 in words is "twenty-one million, seventy thousand, seven hundred thirty-four".