21260612 has 6 divisors (see below), whose sum is σ = 37206078. Its totient is φ = 10630304.

The previous prime is 21260609. The next prime is 21260621. The reversal of 21260612 is 21606212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 3147076 = 4256^2 + 1774^2 .

It is a super-2 number, since 2×21260612² = 904027245229088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2657573 + ... + 2657580.

It is an arithmetic number, because the mean of its divisors is an integer number (6201013).

Almost surely, 2^21260612 is an apocalyptic number.

It is an amenable number.

21260612 is a deficient number, since it is larger than the sum of its proper divisors (15945466).

21260612 is a wasteful number, since it uses less digits than its factorization.

21260612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315157 (or 5315155 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21260612 is about 4610.9231179884. The cubic root of 21260612 is about 277.0290125007.

Adding to 21260612 its reverse (21606212), we get a palindrome (42866824).

The spelling of 21260612 in words is "twenty-one million, two hundred sixty thousand, six hundred twelve".