21060612 has 36 divisors (see below), whose sum is σ = 55075020. Its totient is φ = 6777792.

The previous prime is 21060553. The next prime is 21060619. The reversal of 21060612 is 21606012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17842176 + 3218436 = 4224^2 + 1794^2 .

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 not an unprimeable number, because it can be changed into a prime (21060619) 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, 9043 + ... + 11130.

Almost surely, 2^21060612 is an apocalyptic number.

It is an amenable number.

21060612 is an abundant number, since it is smaller than the sum of its proper divisors (34014408).

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

21060612 is a wasteful number, since it uses less digits than its factorization.

21060612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20212 (or 20207 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21060612 is about 4589.1842412350. The cubic root of 21060612 is about 276.1575974545.

Adding to 21060612 its reverse (21606012), we get a palindrome (42666624).

The spelling of 21060612 in words is "twenty-one million, sixty thousand, six hundred twelve".