21534376151240 has 16 divisors (see below), whose sum is σ = 48452346340380. Its totient is φ = 8613750460480.

The previous prime is 21534376151221. The next prime is 21534376151243. The reversal of 21534376151240 is 4215167343512.

It can be written as a sum of positive squares in 2 ways, for example, as 20328249446596 + 1206126704644 = 4508686^2 + 1098238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21534376151191 and 21534376151200.

It is not an unprimeable number, because it can be changed into a prime (21534376151243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269179701851 + ... + 269179701930.

Almost surely, 2^{21534376151240} is an apocalyptic number.

21534376151240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21534376151240 is an abundant number, since it is smaller than the sum of its proper divisors (26917970189140).

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

21534376151240 is a wasteful number, since it uses less digits than its factorization.

21534376151240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538359403792 (or 538359403788 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 44.

The spelling of 21534376151240 in words is "twenty-one trillion, five hundred thirty-four billion, three hundred seventy-six million, one hundred fifty-one thousand, two hundred forty".