21613782707 has 16 divisors (see below), whose sum is σ = 24418673664. Its totient is φ = 18953028000.

The previous prime is 21613782667. The next prime is 21613782739. The reversal of 21613782707 is 70728731612.

It is a de Polignac number, because none of the positive numbers 2^k-21613782707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21613782787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1457 + ... + 207917.

It is an arithmetic number, because the mean of its divisors is an integer number (1526167104).

Almost surely, 2^21613782707 is an apocalyptic number.

21613782707 is a deficient number, since it is larger than the sum of its proper divisors (2804890957).

21613782707 is a wasteful number, since it uses less digits than its factorization.

21613782707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206810.

The product of its (nonzero) digits is 197568, while the sum is 44.

The spelling of 21613782707 in words is "twenty-one billion, six hundred thirteen million, seven hundred eighty-two thousand, seven hundred seven".