21133220310 has 48 divisors (see below), whose sum is σ = 55225334736. Its totient is φ = 5606913984.

The previous prime is 21133220309. The next prime is 21133220323. The reversal of 21133220310 is 1302233112.

21133220310 is a `hidden beast` number, since 2 + 1 + 1 + 332 + 20 + 310 = 666.

It is a super-2 number, since 2×21133220310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 578244 + ... + 613703.

It is an arithmetic number, because the mean of its divisors is an integer number (1150527807).

Almost surely, 2^21133220310 is an apocalyptic number.

21133220310 is an abundant number, since it is smaller than the sum of its proper divisors (34092114426).

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

21133220310 is a wasteful number, since it uses less digits than its factorization.

21133220310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192157 (or 1192154 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21133220310 its reverse (1302233112), we get a palindrome (22435453422).

The spelling of 21133220310 in words is "twenty-one billion, one hundred thirty-three million, two hundred twenty thousand, three hundred ten".