21202132231220 has 192 divisors, whose sum is σ = 49041205678080. Its totient is φ = 7663891479552.

The previous prime is 21202132231193. The next prime is 21202132231297. The reversal of 21202132231220 is 2213223120212.

It is a happy number.

It is a super-2 number, since 2×21202132231220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5772427304 + ... + 5772430976.

It is an arithmetic number, because the mean of its divisors is an integer number (255422946240).

Almost surely, 2^{21202132231220} is an apocalyptic number.

21202132231220 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 21202132231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24520602839040).

21202132231220 is an abundant number, since it is smaller than the sum of its proper divisors (27839073446860).

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

21202132231220 is a wasteful number, since it uses less digits than its factorization.

21202132231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374 (or 5372 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21202132231220 its reverse (2213223120212), we get a palindrome (23415355351432).

The spelling of 21202132231220 in words is "twenty-one trillion, two hundred two billion, one hundred thirty-two million, two hundred thirty-one thousand, two hundred twenty".