21222111011010 has 512 divisors, whose sum is σ = 65013009481728. Its totient is φ = 4314796231680.

The previous prime is 21222111010907. The next prime is 21222111011069. The reversal of 21222111011010 is 1011011122212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3269463865 + ... + 3269470355.

It is an arithmetic number, because the mean of its divisors is an integer number (126978534144).

Almost surely, 2^{21222111011010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222111011010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32506504740864).

21222111011010 is an abundant number, since it is smaller than the sum of its proper divisors (43790898470718).

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

21222111011010 is a wasteful number, since it uses less digits than its factorization.

21222111011010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21222111011010 its reverse (1011011122212), we get a palindrome (22233122133222).

The spelling of 21222111011010 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, eleven thousand, ten".