21063950 has 12 divisors (see below), whose sum is σ = 39179040. Its totient is φ = 8425560.

The previous prime is 21063907. The next prime is 21063983. The reversal of 21063950 is 5936012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 210590 + ... + 210689.

It is an arithmetic number, because the mean of its divisors is an integer number (3264920).

Almost surely, 2^21063950 is an apocalyptic number.

21063950 is a deficient number, since it is larger than the sum of its proper divisors (18115090).

21063950 is a wasteful number, since it uses less digits than its factorization.

21063950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421291 (or 421286 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 21063950 is about 4589.5479080188. The cubic root of 21063950 is about 276.1721865425.

Adding to 21063950 its reverse (5936012), we get a palindrome (26999962).

The spelling of 21063950 in words is "twenty-one million, sixty-three thousand, nine hundred fifty".