21000120222 has 16 divisors (see below), whose sum is σ = 42024836880. Its totient is φ = 6995940672.

The previous prime is 21000120221. The next prime is 21000120257. The reversal of 21000120222 is 22202100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000120198 and 21000120207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000120221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1013743 + ... + 1034250.

It is an arithmetic number, because the mean of its divisors is an integer number (2626552305).

Almost surely, 2^21000120222 is an apocalyptic number.

21000120222 is an abundant number, since it is smaller than the sum of its proper divisors (21024716658).

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

21000120222 is a wasteful number, since it uses less digits than its factorization.

21000120222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049707.

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

Adding to 21000120222 its reverse (22202100012), we get a palindrome (43202220234).

The spelling of 21000120222 in words is "twenty-one billion, one hundred twenty thousand, two hundred twenty-two".