21220246000 has 80 divisors (see below), whose sum is σ = 52278939648. Its totient is φ = 8327904000.

The previous prime is 21220245997. The next prime is 21220246051. The reversal of 21220246000 is 64202212.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5905 + ... + 206095.

Almost surely, 2^21220246000 is an apocalyptic number.

21220246000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220246000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26139469824).

21220246000 is an abundant number, since it is smaller than the sum of its proper divisors (31058693648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220246000 is a wasteful number, since it uses less digits than its factorization.

21220246000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200267 (or 200251 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21220246000 its reverse (64202212), we get a palindrome (21284448212).

The spelling of 21220246000 in words is "twenty-one billion, two hundred twenty million, two hundred forty-six thousand".