21540324377244 has 48 divisors (see below), whose sum is σ = 50401592720640. Its totient is φ = 7159999737600.

The previous prime is 21540324377239. The next prime is 21540324377287. The reversal of 21540324377244 is 44277342304512.

It is a junction number, because it is equal to n+sod(n) for n = 21540324377193 and 21540324377202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14995537 + ... + 16369079.

It is an arithmetic number, because the mean of its divisors is an integer number (1050033181680).

Almost surely, 2^{21540324377244} is an apocalyptic number.

It is an amenable number.

21540324377244 is an abundant number, since it is smaller than the sum of its proper divisors (28861268343396).

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

21540324377244 is a wasteful number, since it uses less digits than its factorization.

21540324377244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377210 (or 1377208 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 48.

The spelling of 21540324377244 in words is "twenty-one trillion, five hundred forty billion, three hundred twenty-four million, three hundred seventy-seven thousand, two hundred forty-four".