21540324377240 has 32 divisors (see below), whose sum is σ = 48544793084880. Its totient is φ = 8602074064512.

The previous prime is 21540324377239. The next prime is 21540324377287. The reversal of 21540324377240 is 4277342304512.

It is a junction number, because it is equal to n+sod(n) for n = 21540324377191 and 21540324377200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439215374 + ... + 439264413.

Almost surely, 2^{21540324377240} is an apocalyptic number.

21540324377240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21540324377240 is an abundant number, since it is smaller than the sum of its proper divisors (27004468707640).

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

21540324377240 is a wasteful number, since it uses less digits than its factorization.

21540324377240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878480411 (or 878480407 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 44.

The spelling of 21540324377240 in words is "twenty-one trillion, five hundred forty billion, three hundred twenty-four million, three hundred seventy-seven thousand, two hundred forty".