21427060785431 has 8 divisors (see below), whose sum is σ = 25552768141824. Its totient is φ = 17567528097240.

The previous prime is 21427060785421. The next prime is 21427060785451. The reversal of 21427060785431 is 13458706072412.

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 21427060785431 - 2¹⁴ = 21427060769047 is a prime.

It is a super-2 number, since 2×21427060785431² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21427060785431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21427060785401) 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, 66543666875 + ... + 66543667196.

It is an arithmetic number, because the mean of its divisors is an integer number (3194096017728).

Almost surely, 2^{21427060785431} is an apocalyptic number.

21427060785431 is a deficient number, since it is larger than the sum of its proper divisors (4125707356393).

21427060785431 is a wasteful number, since it uses less digits than its factorization.

21427060785431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133087334101.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 21427060785431 in words is "twenty-one trillion, four hundred twenty-seven billion, sixty million, seven hundred eighty-five thousand, four hundred thirty-one".