21443211210 has 16 divisors (see below), whose sum is σ = 51463706976. Its totient is φ = 5718189648.

The previous prime is 21443211199. The next prime is 21443211217. The reversal of 21443211210 is 1211234412.

It is a super-2 number, since 2×21443211210² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21443211217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357386824 + ... + 357386883.

It is an arithmetic number, because the mean of its divisors is an integer number (3216481686).

Almost surely, 2^21443211210 is an apocalyptic number.

21443211210 is an abundant number, since it is smaller than the sum of its proper divisors (30020495766).

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

21443211210 is a wasteful number, since it uses less digits than its factorization.

21443211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714773717.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21443211210 its reverse (1211234412), we get a palindrome (22654445622).

The spelling of 21443211210 in words is "twenty-one billion, four hundred forty-three million, two hundred eleven thousand, two hundred ten".