21070548 has 36 divisors (see below), whose sum is σ = 56396340. Its totient is φ = 6610176.

The previous prime is 21070541. The next prime is 21070549. The reversal of 21070548 is 84507012.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 11410884 = 3108^2 + 3378^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16603 + ... + 17826.

It is an arithmetic number, because the mean of its divisors is an integer number (1566565).

Almost surely, 2^21070548 is an apocalyptic number.

It is an amenable number.

21070548 is an abundant number, since it is smaller than the sum of its proper divisors (35325792).

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

21070548 is a wasteful number, since it uses less digits than its factorization.

21070548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34456 (or 34451 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 21070548 is about 4590.2666589208. The cubic root of 21070548 is about 276.2010192774.

The spelling of 21070548 in words is "twenty-one million, seventy thousand, five hundred forty-eight".