21018050 has 12 divisors (see below), whose sum is σ = 39093666. Its totient is φ = 8407200.

The previous prime is 21018043. The next prime is 21018073. The reversal of 21018050 is 5081012.

It can be written as a sum of positive squares in 3 ways, for example, as 19651489 + 1366561 = 4433^2 + 1169^2 .

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, 210131 + ... + 210230.

Almost surely, 2^21018050 is an apocalyptic number.

21018050 is a deficient number, since it is larger than the sum of its proper divisors (18075616).

21018050 is a wasteful number, since it uses less digits than its factorization.

21018050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420373 (or 420368 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 21018050 is about 4584.5446884069. The cubic root of 21018050 is about 275.9714403691.

Adding to 21018050 its reverse (5081012), we get a palindrome (26099062).

The spelling of 21018050 in words is "twenty-one million, eighteen thousand, fifty".