21109470565431 has 8 divisors (see below), whose sum is σ = 29053894971904. Its totient is φ = 13619013267960.

The previous prime is 21109470565429. The next prime is 21109470565439. The reversal of 21109470565431 is 13456507490112.

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

It is not a de Polignac number, because 21109470565431 - 2¹ = 21109470565429 is a prime.

It is a super-2 number, since 2×21109470565431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109470565439) 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, 113491777141 + ... + 113491777326.

It is an arithmetic number, because the mean of its divisors is an integer number (3631736871488).

Almost surely, 2^{21109470565431} is an apocalyptic number.

21109470565431 is a deficient number, since it is larger than the sum of its proper divisors (7944424406473).

21109470565431 is a wasteful number, since it uses less digits than its factorization.

21109470565431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226983554501.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 21109470565431 in words is "twenty-one trillion, one hundred nine billion, four hundred seventy million, five hundred sixty-five thousand, four hundred thirty-one".