21223220202 has 48 divisors (see below), whose sum is σ = 47450581152. Its totient is φ = 6850539360.

The previous prime is 21223220173. The next prime is 21223220209. The reversal of 21223220202 is 20202232212.

21223220202 is a `hidden beast` number, since 21 + 223 + 220 + 202 = 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 (21223220209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65013 + ... + 216039.

It is an arithmetic number, because the mean of its divisors is an integer number (988553774).

Almost surely, 2^21223220202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21223220202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23725290576).

21223220202 is an abundant number, since it is smaller than the sum of its proper divisors (26227360950).

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

21223220202 is a wasteful number, since it uses less digits than its factorization.

21223220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151283 (or 151280 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21223220202 its reverse (20202232212), we get a palindrome (41425452414).

The spelling of 21223220202 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty thousand, two hundred two".