21021222324140 has 96 divisors (see below), whose sum is σ = 46228798586880. Its totient is φ = 8019940262400.

The previous prime is 21021222324127. The next prime is 21021222324173. The reversal of 21021222324140 is 4142322212012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16548509 + ... + 17773451.

It is an arithmetic number, because the mean of its divisors is an integer number (481549985280).

Almost surely, 2^{21021222324140} is an apocalyptic number.

21021222324140 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 21021222324140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23114399293440).

21021222324140 is an abundant number, since it is smaller than the sum of its proper divisors (25207576262740).

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

21021222324140 is a wasteful number, since it uses less digits than its factorization.

21021222324140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225383 (or 1225381 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21021222324140 its reverse (4142322212012), we get a palindrome (25163544536152).

The spelling of 21021222324140 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, three hundred twenty-four thousand, one hundred forty".