21210213250 has 64 divisors (see below), whose sum is σ = 40006512000. Its totient is φ = 8420068800.

The previous prime is 21210213179. The next prime is 21210213263. The reversal of 21210213250 is 5231201212.

It is a super-2 number, since 2×21210213250² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24691321 + ... + 24692179.

It is an arithmetic number, because the mean of its divisors is an integer number (625101750).

Almost surely, 2^21210213250 is an apocalyptic number.

21210213250 is a deficient number, since it is larger than the sum of its proper divisors (18796298750).

21210213250 is a wasteful number, since it uses less digits than its factorization.

21210213250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508 (or 1498 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21210213250 its reverse (5231201212), we get a palindrome (26441414462).

The spelling of 21210213250 in words is "twenty-one billion, two hundred ten million, two hundred thirteen thousand, two hundred fifty".