21424784251031 has 24 divisors (see below), whose sum is σ = 24941722377600. Its totient is φ = 18350095845312.

The previous prime is 21424784250949. The next prime is 21424784251049. The reversal of 21424784251031 is 13015248742412.

It is not a de Polignac number, because 21424784251031 - 2²² = 21424780056727 is a prime.

It is a super-2 number, since 2×21424784251031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21424784851031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 356972381 + ... + 357032393.

It is an arithmetic number, because the mean of its divisors is an integer number (1039238432400).

Almost surely, 2^{21424784251031} is an apocalyptic number.

21424784251031 is a deficient number, since it is larger than the sum of its proper divisors (3516938126569).

21424784251031 is a wasteful number, since it uses less digits than its factorization.

21424784251031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65463 (or 65456 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 44.

The spelling of 21424784251031 in words is "twenty-one trillion, four hundred twenty-four billion, seven hundred eighty-four million, two hundred fifty-one thousand, thirty-one".