21041231520144 has 160 divisors (see below), whose sum is σ = 60833289420288. Its totient is φ = 6211503232000.

The previous prime is 21041231520137. The next prime is 21041231520217. The reversal of 21041231520144 is 44102513214012.

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, 14074039 + ... + 15497129.

Almost surely, 2^{21041231520144} is an apocalyptic number.

21041231520144 is a gapful number since it is divisible by the number (24) 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 21041231520144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30416644710144).

21041231520144 is an abundant number, since it is smaller than the sum of its proper divisors (39792057900144).

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

21041231520144 is a wasteful number, since it uses less digits than its factorization.

21041231520144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423837 (or 1423831 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 21041231520144 its reverse (44102513214012), we get a palindrome (65143744734156).

The spelling of 21041231520144 in words is "twenty-one trillion, forty-one billion, two hundred thirty-one million, five hundred twenty thousand, one hundred forty-four".