21500010112340 has 24 divisors (see below), whose sum is σ = 45150789991272. Its totient is φ = 8599857615360.

The previous prime is 21500010112327. The next prime is 21500010112367. The reversal of 21500010112340 is 4321101000512.

It can be written as a sum of positive squares in 4 ways, for example, as 6197468176 + 21493812644164 = 78724^2 + 4636142^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 7943969 + ... + 10300808.

It is an arithmetic number, because the mean of its divisors is an integer number (1881282916303).

Almost surely, 2^{21500010112340} is an apocalyptic number.

21500010112340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21500010112340 is an abundant number, since it is smaller than the sum of its proper divisors (23650779878932).

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

21500010112340 is a wasteful number, since it uses less digits than its factorization.

21500010112340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18303707 (or 18303705 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21500010112340 its reverse (4321101000512), we get a palindrome (25821111112852).

The spelling of 21500010112340 in words is "twenty-one trillion, five hundred billion, ten million, one hundred twelve thousand, three hundred forty".