21152650 has 12 divisors (see below), whose sum is σ = 39344022. Its totient is φ = 8461040.

The previous prime is 21152591. The next prime is 21152657. The reversal of 21152650 is 5625112.

It can be written as a sum of positive squares in 3 ways, for example, as 19386409 + 1766241 = 4403^2 + 1329^2 .

It is not an unprimeable number, because it can be changed into a prime (21152657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211477 + ... + 211576.

Almost surely, 2^21152650 is an apocalyptic number.

21152650 is a deficient number, since it is larger than the sum of its proper divisors (18191372).

21152650 is a wasteful number, since it uses less digits than its factorization.

21152650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423065 (or 423060 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 21152650 is about 4599.2010175682. The cubic root of 21152650 is about 276.5592960889.

Adding to 21152650 its reverse (5625112), we get a palindrome (26777762).

The spelling of 21152650 in words is "twenty-one million, one hundred fifty-two thousand, six hundred fifty".