21050063 has 16 divisors (see below), whose sum is σ = 23141376. Its totient is φ = 19069440.

The previous prime is 21050059. The next prime is 21050101. The reversal of 21050063 is 36005012.

It is a cyclic number.

It is not a de Polignac number, because 21050063 - 2² = 21050059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54770 + ... + 55152.

It is an arithmetic number, because the mean of its divisors is an integer number (1446336).

Almost surely, 2^21050063 is an apocalyptic number.

21050063 is a deficient number, since it is larger than the sum of its proper divisors (2091313).

21050063 is a wasteful number, since it uses less digits than its factorization.

21050063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21050063 is about 4588.0347644716. The cubic root of 21050063 is about 276.1114817794. Note that the first 3 decimals are identical.

Adding to 21050063 its reverse (36005012), we get a palindrome (57055075).

The spelling of 21050063 in words is "twenty-one million, fifty thousand, sixty-three".