21220121111202 has 160 divisors (see below), whose sum is σ = 54303172673904. Its totient is φ = 6135599923200.

The previous prime is 21220121111177. The next prime is 21220121111209. The reversal of 21220121111202 is 20211112102212.

21220121111202 is a `hidden beast` number, since 21 + 220 + 1 + 211 + 11 + 202 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 11450176883721 + 9769944227481 = 3383811^2 + 3125691^2 .

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 (21220121111209) 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 79 ways as a sum of consecutive naturals, for example, 22486752 + ... + 23411412.

Almost surely, 2^{21220121111202} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220121111202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27151586336952).

21220121111202 is an abundant number, since it is smaller than the sum of its proper divisors (33083051562702).

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

21220121111202 is a wasteful number, since it uses less digits than its factorization.

21220121111202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925346 (or 925337 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21220121111202 its reverse (20211112102212), we get a palindrome (41431233213414).

The spelling of 21220121111202 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred eleven thousand, two hundred two".