21699750405 has 32 divisors (see below), whose sum is σ = 35581125888. Its totient is φ = 11286259200.

The previous prime is 21699750367. The next prime is 21699750427. The reversal of 21699750405 is 50405799612.

It is not a de Polignac number, because 21699750405 - 2⁶ = 21699750341 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1876752 + ... + 1888278.

It is an arithmetic number, because the mean of its divisors is an integer number (1111910184).

Almost surely, 2^21699750405 is an apocalyptic number.

It is an amenable number.

21699750405 is a deficient number, since it is larger than the sum of its proper divisors (13881375483).

21699750405 is a wasteful number, since it uses less digits than its factorization.

21699750405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14637.

The product of its (nonzero) digits is 680400, while the sum is 48.

The spelling of 21699750405 in words is "twenty-one billion, six hundred ninety-nine million, seven hundred fifty thousand, four hundred five".