21202202120 has 128 divisors (see below), whose sum is σ = 55184250240. Its totient is φ = 7245680640.

The previous prime is 21202202113. The next prime is 21202202129. The reversal of 21202202120 is 2120220212.

It is a junction number, because it is equal to n+sod(n) for n = 21202202095 and 21202202104.

It is not an unprimeable number, because it can be changed into a prime (21202202129) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6378779 + ... + 6382101.

It is an arithmetic number, because the mean of its divisors is an integer number (431126955).

Almost surely, 2^21202202120 is an apocalyptic number.

21202202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202202120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27592125120).

21202202120 is an abundant number, since it is smaller than the sum of its proper divisors (33982048120).

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

21202202120 is a wasteful number, since it uses less digits than its factorization.

21202202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215 (or 4211 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202202120 its reverse (2120220212), we get a palindrome (23322422332).

It can be divided in two parts, 21202 and 202120, that added together give a palindrome (223322).

The spelling of 21202202120 in words is "twenty-one billion, two hundred two million, two hundred two thousand, one hundred twenty".