21351705735 has 16 divisors (see below), whose sum is σ = 35340755040. Its totient is φ = 10994901120.

The previous prime is 21351705733. The next prime is 21351705737. The reversal of 21351705735 is 53750715312.

It is an interprime number because it is at equal distance from previous prime (21351705733) and next prime (21351705737).

It is not a de Polignac number, because 21351705735 - 2¹ = 21351705733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21351705693 and 21351705702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351705733) 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 15 ways as a sum of consecutive naturals, for example, 24541756 + ... + 24542625.

It is an arithmetic number, because the mean of its divisors is an integer number (2208797190).

Almost surely, 2^21351705735 is an apocalyptic number.

21351705735 is a deficient number, since it is larger than the sum of its proper divisors (13989049305).

21351705735 is a wasteful number, since it uses less digits than its factorization.

21351705735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49084418.

The product of its (nonzero) digits is 110250, while the sum is 39.

The spelling of 21351705735 in words is "twenty-one billion, three hundred fifty-one million, seven hundred five thousand, seven hundred thirty-five".