21150770 has 8 divisors (see below), whose sum is σ = 38071404. Its totient is φ = 8460304.

The previous prime is 21150757. The next prime is 21150803. The reversal of 21150770 is 7705112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19298449 + 1852321 = 4393^2 + 1361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057529 + ... + 1057548.

Almost surely, 2^21150770 is an apocalyptic number.

21150770 is a deficient number, since it is larger than the sum of its proper divisors (16920634).

21150770 is a wasteful number, since it uses less digits than its factorization.

21150770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115084.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 21150770 is about 4598.9966297009. The cubic root of 21150770 is about 276.5511025233.

Adding to 21150770 its reverse (7705112), we get a palindrome (28855882).

The spelling of 21150770 in words is "twenty-one million, one hundred fifty thousand, seven hundred seventy".