21143691543527 has 8 divisors (see below), whose sum is σ = 24164407303200. Its totient is φ = 18123022882944.

The previous prime is 21143691543521. The next prime is 21143691543589. The reversal of 21143691543527 is 72534519634112.

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

It is not a de Polignac number, because 21143691543527 - 2²² = 21143687349223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143691543521) 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, 10807502 + ... + 12613067.

It is an arithmetic number, because the mean of its divisors is an integer number (3020550912900).

Almost surely, 2^{21143691543527} is an apocalyptic number.

21143691543527 is a deficient number, since it is larger than the sum of its proper divisors (3020715759673).

21143691543527 is a wasteful number, since it uses less digits than its factorization.

21143691543527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23549545.

The product of its digits is 5443200, while the sum is 53.

The spelling of 21143691543527 in words is "twenty-one trillion, one hundred forty-three billion, six hundred ninety-one million, five hundred forty-three thousand, five hundred twenty-seven".