21211121132432 has 320 divisors, whose sum is σ = 52679131176960. Its totient is φ = 8035067289600.

The previous prime is 21211121132423. The next prime is 21211121132449. The reversal of 21211121132432 is 23423112111212.

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, 5406860423 + ... + 5406864345.

It is an arithmetic number, because the mean of its divisors is an integer number (164622284928).

Almost surely, 2^{21211121132432} is an apocalyptic number.

21211121132432 is a gapful number since it is divisible by the number (22) 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 21211121132432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26339565588480).

21211121132432 is an abundant number, since it is smaller than the sum of its proper divisors (31468010044528).

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

21211121132432 is a wasteful number, since it uses less digits than its factorization.

21211121132432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4862 (or 4856 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

Adding to 21211121132432 its reverse (23423112111212), we get a palindrome (44634233243644).

The spelling of 21211121132432 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred thirty-two thousand, four hundred thirty-two".