21041143311440 has 80 divisors (see below), whose sum is σ = 55911729694080. Its totient is φ = 7213795822080.

The previous prime is 21041143311431. The next prime is 21041143311449. The reversal of 21041143311440 is 4411334114012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21041143311431) and next prime (21041143311449).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041143311449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12408671 + ... + 14002049.

It is an arithmetic number, because the mean of its divisors is an integer number (698896621176).

Almost surely, 2^{21041143311440} is an apocalyptic number.

21041143311440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041143311440 is an abundant number, since it is smaller than the sum of its proper divisors (34870586382640).

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

21041143311440 is a wasteful number, since it uses less digits than its factorization.

21041143311440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616980 (or 1616974 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 21041143311440 its reverse (4411334114012), we get a palindrome (25452477425452).

The spelling of 21041143311440 in words is "twenty-one trillion, forty-one billion, one hundred forty-three million, three hundred eleven thousand, four hundred forty".