21213023310 has 64 divisors (see below), whose sum is σ = 57068746560. Its totient is φ = 5606737920.

The previous prime is 21213023243. The next prime is 21213023311. The reversal of 21213023310 is 1332031212.

It is a super-2 number, since 2×21213023310² (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 not an unprimeable number, because it can be changed into a prime (21213023311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317131 + ... + 378150.

It is an arithmetic number, because the mean of its divisors is an integer number (891699165).

Almost surely, 2^21213023310 is an apocalyptic number.

21213023310 is an abundant number, since it is smaller than the sum of its proper divisors (35855723250).

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

21213023310 is a wasteful number, since it uses less digits than its factorization.

21213023310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695410 (or 695404 counting only the distinct ones).

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

Adding to 21213023310 its reverse (1332031212), we get a palindrome (22545054522).

The spelling of 21213023310 in words is "twenty-one billion, two hundred thirteen million, twenty-three thousand, three hundred ten".