21050623 has 8 divisors (see below), whose sum is σ = 22999680. Its totient is φ = 19107480.

The previous prime is 21050611. The next prime is 21050629. The reversal of 21050623 is 32605012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21050623 - 2⁵ = 21050591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21050623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9648 + ... + 11626.

It is an arithmetic number, because the mean of its divisors is an integer number (2874960).

Almost surely, 2^21050623 is an apocalyptic number.

21050623 is a deficient number, since it is larger than the sum of its proper divisors (1949057).

21050623 is a wasteful number, since it uses less digits than its factorization.

21050623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2957.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21050623 is about 4588.0957923740. The cubic root of 21050623 is about 276.1139302449.

Adding to 21050623 its reverse (32605012), we get a palindrome (53655635).

It can be divided in two parts, 2 and 1050623, that added together give a square (1050625 = 1025²).

The spelling of 21050623 in words is "twenty-one million, fifty thousand, six hundred twenty-three".