21150620 has 12 divisors (see below), whose sum is σ = 44416344. Its totient is φ = 8460240.

The previous prime is 21150607. The next prime is 21150631. The reversal of 21150620 is 2605112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528746 + ... + 528785.

It is an arithmetic number, because the mean of its divisors is an integer number (3701362).

Almost surely, 2^21150620 is an apocalyptic number.

21150620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21150620 is an abundant number, since it is smaller than the sum of its proper divisors (23265724).

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

21150620 is a wasteful number, since it uses less digits than its factorization.

21150620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057540 (or 1057538 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21150620 is about 4598.9803217670. The cubic root of 21150620 is about 276.5504487604.

Adding to 21150620 its reverse (2605112), we get a palindrome (23755732).

The spelling of 21150620 in words is "twenty-one million, one hundred fifty thousand, six hundred twenty".