21060340 has 24 divisors (see below), whose sum is σ = 50545152. Its totient is φ = 7220640.

The previous prime is 21060329. The next prime is 21060359. The reversal of 21060340 is 4306012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75076 + ... + 75355.

It is an arithmetic number, because the mean of its divisors is an integer number (2106048).

Almost surely, 2^21060340 is an apocalyptic number.

21060340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21060340 is an abundant number, since it is smaller than the sum of its proper divisors (29484812).

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

21060340 is a wasteful number, since it uses less digits than its factorization.

21060340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150447 (or 150445 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21060340 is about 4589.1546062429. The cubic root of 21060340 is about 276.1564085813.

Adding to 21060340 its reverse (4306012), we get a palindrome (25366352).

The spelling of 21060340 in words is "twenty-one million, sixty thousand, three hundred forty".