21771700431 has 32 divisors (see below), whose sum is σ = 31416161280. Its totient is φ = 13332034944.

The previous prime is 21771700421. The next prime is 21771700501. The reversal of 21771700431 is 13400717712.

It is not a de Polignac number, because 21771700431 - 2⁹ = 21771699919 is a prime.

It is a super-2 number, since 2×21771700431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21771700392 and 21771700401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21771700421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9135066 + ... + 9137448.

It is an arithmetic number, because the mean of its divisors is an integer number (981755040).

Almost surely, 2^21771700431 is an apocalyptic number.

21771700431 is a deficient number, since it is larger than the sum of its proper divisors (9644460849).

21771700431 is a wasteful number, since it uses less digits than its factorization.

21771700431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455.

The product of its (nonzero) digits is 8232, while the sum is 33.

The spelling of 21771700431 in words is "twenty-one billion, seven hundred seventy-one million, seven hundred thousand, four hundred thirty-one".