21133221010 has 32 divisors (see below), whose sum is σ = 43682068800. Its totient is φ = 7280343360.

The previous prime is 21133220993. The next prime is 21133221013. The reversal of 21133221010 is 1012233112.

It is a super-2 number, since 2×21133221010² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21133221013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5053705 + ... + 5057884.

It is an arithmetic number, because the mean of its divisors is an integer number (1365064650).

Almost surely, 2^21133221010 is an apocalyptic number.

21133221010 is an abundant number, since it is smaller than the sum of its proper divisors (22548847790).

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

21133221010 is a wasteful number, since it uses less digits than its factorization.

21133221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111626.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21133221010 its reverse (1012233112), we get a palindrome (22145454122).

The spelling of 21133221010 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, ten".