21213320010 has 16 divisors (see below), whose sum is σ = 50911968096. Its totient is φ = 5656885328.

The previous prime is 21213319999. The next prime is 21213320017. The reversal of 21213320010 is 1002331212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21213320017) 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, 353555304 + ... + 353555363.

It is an arithmetic number, because the mean of its divisors is an integer number (3181998006).

Almost surely, 2^21213320010 is an apocalyptic number.

21213320010 is an abundant number, since it is smaller than the sum of its proper divisors (29698648086).

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

21213320010 is a wasteful number, since it uses less digits than its factorization.

21213320010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707110677.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21213320010 its reverse (1002331212), we get a palindrome (22215651222).

The spelling of 21213320010 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, ten".