21120221210202 has 24 divisors (see below), whose sum is σ = 45792546954336. Its totient is φ = 7035140249736.

The previous prime is 21120221210201. The next prime is 21120221210251. The reversal of 21120221210202 is 20201212202112.

It is a happy number.

21120221210202 is a `hidden beast` number, since 2 + 11 + 20 + 221 + 210 + 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 (21120221210201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 411097518 + ... + 411148889.

It is an arithmetic number, because the mean of its divisors is an integer number (1908022789764).

Almost surely, 2^{21120221210202} is an apocalyptic number.

21120221210202 is an abundant number, since it is smaller than the sum of its proper divisors (24672325744134).

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

21120221210202 is a wasteful number, since it uses less digits than its factorization.

21120221210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822247842 (or 822247839 counting only the distinct ones).

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

Adding to 21120221210202 its reverse (20201212202112), we get a palindrome (41321433412314).

The spelling of 21120221210202 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred two".