21006226250 has 40 divisors (see below), whose sum is σ = 39519999552. Its totient is φ = 8371350000.

The previous prime is 21006226243. The next prime is 21006226253. The reversal of 21006226250 is 5262260012.

It is not an unprimeable number, because it can be changed into a prime (21006226253) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 307745 + ... + 369755.

Almost surely, 2^21006226250 is an apocalyptic number.

21006226250 is a deficient number, since it is larger than the sum of its proper divisors (18513773302).

21006226250 is an equidigital number, since it uses as much as digits as its factorization.

21006226250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62304 (or 62289 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21006226250 its reverse (5262260012), we get a palindrome (26268486262).

The spelling of 21006226250 in words is "twenty-one billion, six million, two hundred twenty-six thousand, two hundred fifty".