21223212010 has 128 divisors (see below), whose sum is σ = 52485801984. Its totient is φ = 5964053760.

The previous prime is 21223212001. The next prime is 21223212011. The reversal of 21223212010 is 1021232212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21223212011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 405777 + ... + 455083.

It is an arithmetic number, because the mean of its divisors is an integer number (410045328).

Almost surely, 2^21223212010 is an apocalyptic number.

21223212010 is an abundant number, since it is smaller than the sum of its proper divisors (31262589974).

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

21223212010 is a wasteful number, since it uses less digits than its factorization.

21223212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49388.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21223212010 its reverse (1021232212), we get a palindrome (22244444222).

The spelling of 21223212010 in words is "twenty-one billion, two hundred twenty-three million, two hundred twelve thousand, ten".