2100021222 has 64 divisors (see below), whose sum is σ = 4601580480. Its totient is φ = 635019264.

The previous prime is 2100021181. The next prime is 2100021281. The reversal of 2100021222 is 2221200012.

It is a junction number, because it is equal to n+sod(n) for n = 2100021198 and 2100021207.

It is a congruent number.

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, 2260054 + ... + 2260982.

It is an arithmetic number, because the mean of its divisors is an integer number (71899695).

Almost surely, 2^2100021222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2100021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2300790240).

2100021222 is an abundant number, since it is smaller than the sum of its proper divisors (2501559258).

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

2100021222 is a wasteful number, since it uses less digits than its factorization.

2100021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2100021222 is about 45825.9884999767. The cubic root of 2100021222 is about 1280.5834786954.

Adding to 2100021222 its reverse (2221200012), we get a palindrome (4321221234).

The spelling of 2100021222 in words is "two billion, one hundred million, twenty-one thousand, two hundred twenty-two".