21282221010 has 64 divisors (see below), whose sum is σ = 52910599680. Its totient is φ = 5472096000.

The previous prime is 21282220997. The next prime is 21282221041. The reversal of 21282221010 is 1012228212.

It is a super-2 number, since 2×21282221010² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 637084 + ... + 669656.

It is an arithmetic number, because the mean of its divisors is an integer number (826728120).

Almost surely, 2^21282221010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21282221010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26455299840).

21282221010 is an abundant number, since it is smaller than the sum of its proper divisors (31628378670).

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

21282221010 is a wasteful number, since it uses less digits than its factorization.

21282221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33363.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21282221010 its reverse (1012228212), we get a palindrome (22294449222).

The spelling of 21282221010 in words is "twenty-one billion, two hundred eighty-two million, two hundred twenty-one thousand, ten".