21221223310 has 48 divisors (see below), whose sum is σ = 46773329040. Its totient is φ = 6892905600.

The previous prime is 21221223307. The next prime is 21221223313. The reversal of 21221223310 is 1332212212.

It is an interprime number because it is at equal distance from previous prime (21221223307) and next prime (21221223313).

It is a super-2 number, since 2×21221223310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221223313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1130391 + ... + 1149010.

It is an arithmetic number, because the mean of its divisors is an integer number (974444355).

Almost surely, 2^21221223310 is an apocalyptic number.

21221223310 is an abundant number, since it is smaller than the sum of its proper divisors (25552105730).

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

21221223310 is a wasteful number, since it uses less digits than its factorization.

21221223310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2279441 (or 2279434 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21221223310 its reverse (1332212212), we get a palindrome (22553435522).

The spelling of 21221223310 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-three thousand, three hundred ten".