21222000012210 has 128 divisors (see below), whose sum is σ = 52646035193856. Its totient is φ = 5472447402240.

The previous prime is 21222000012209. The next prime is 21222000012211. The reversal of 21222000012210 is 1221000022212.

It is an interprime number because it is at equal distance from previous prime (21222000012209) and next prime (21222000012211).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21222000012210.

It is not an unprimeable number, because it can be changed into a prime (21222000012211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34248399 + ... + 34862541.

It is an arithmetic number, because the mean of its divisors is an integer number (411297149952).

Almost surely, 2^{21222000012210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222000012210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26323017596928).

21222000012210 is an abundant number, since it is smaller than the sum of its proper divisors (31424035181646).

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

21222000012210 is a wasteful number, since it uses less digits than its factorization.

21222000012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614520.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222000012210 its reverse (1221000022212), we get a palindrome (22443000034422).

The spelling of 21222000012210 in words is "twenty-one trillion, two hundred twenty-two billion, twelve thousand, two hundred ten".