21150221141224 has 128 divisors (see below), whose sum is σ = 47124307077120. Its totient is φ = 8708323737600.

The previous prime is 21150221141213. The next prime is 21150221141243. The reversal of 21150221141224 is 42214112205112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 21150221141192 and 21150221141201.

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, 181244304 + ... + 181360960.

It is an arithmetic number, because the mean of its divisors is an integer number (368158649040).

Almost surely, 2^{21150221141224} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21150221141224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23562153538560).

21150221141224 is an abundant number, since it is smaller than the sum of its proper divisors (25974085935896).

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

21150221141224 is a wasteful number, since it uses less digits than its factorization.

21150221141224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117459 (or 117455 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

Adding to 21150221141224 its reverse (42214112205112), we get a palindrome (63364333346336).

The spelling of 21150221141224 in words is "twenty-one trillion, one hundred fifty billion, two hundred twenty-one million, one hundred forty-one thousand, two hundred twenty-four".