21502734107 has 4 divisors (see below), whose sum is σ = 21960239136. Its totient is φ = 21045229080.

The previous prime is 21502734101. The next prime is 21502734119. The reversal of 21502734107 is 70143720512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21502734107 - 2¹⁴ = 21502717723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21502734101) 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 3 ways as a sum of consecutive naturals, for example, 228752444 + ... + 228752537.

It is an arithmetic number, because the mean of its divisors is an integer number (5490059784).

Almost surely, 2^21502734107 is an apocalyptic number.

21502734107 is a deficient number, since it is larger than the sum of its proper divisors (457505029).

21502734107 is an equidigital number, since it uses as much as digits as its factorization.

21502734107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457505028.

The product of its (nonzero) digits is 11760, while the sum is 32.

The spelling of 21502734107 in words is "twenty-one billion, five hundred two million, seven hundred thirty-four thousand, one hundred seven".