20211222211002 has 96 divisors (see below), whose sum is σ = 45156551476608. Its totient is φ = 6528472587648.

The previous prime is 20211222211001. The next prime is 20211222211007. The reversal of 20211222211002 is 20011222211202.

It is a happy number.

20211222211002 is a `hidden beast` number, since 20 + 211 + 222 + 211 + 0 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20211222211001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 871049133 + ... + 871072335.

It is an arithmetic number, because the mean of its divisors is an integer number (470380744548).

Almost surely, 2^{20211222211002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20211222211002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22578275738304).

20211222211002 is an abundant number, since it is smaller than the sum of its proper divisors (24945329265606).

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

20211222211002 is a wasteful number, since it uses less digits than its factorization.

20211222211002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28484 (or 28481 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20211222211002 its reverse (20011222211202), we get a palindrome (40222444422204).

The spelling of 20211222211002 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, two".