21506741131547 has 8 divisors (see below), whose sum is σ = 24584884951776. Its totient is φ = 18430035368832.

The previous prime is 21506741131531. The next prime is 21506741131609. The reversal of 21506741131547 is 74513114760512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21506741131547 - 2⁴ = 21506741131531 is a prime.

It is a super-2 number, since 2×21506741131547² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21506741131247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359482328 + ... + 359542149.

It is an arithmetic number, because the mean of its divisors is an integer number (3073110618972).

Almost surely, 2^{21506741131547} is an apocalyptic number.

21506741131547 is a deficient number, since it is larger than the sum of its proper divisors (3078143820229).

21506741131547 is an equidigital number, since it uses as much as digits as its factorization.

21506741131547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719028757.

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 21506741131547 in words is "twenty-one trillion, five hundred six billion, seven hundred forty-one million, one hundred thirty-one thousand, five hundred forty-seven".