21778205404462 has 16 divisors (see below), whose sum is σ = 35181697088160. Its totient is φ = 10051045381152.

The previous prime is 21778205404451. The next prime is 21778205404589. The reversal of 21778205404462 is 26440450287712.

It is a super-3 number, since 3×21778205404462³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17470762 + ... + 18675757.

It is an arithmetic number, because the mean of its divisors is an integer number (2198856068010).

Almost surely, 2^{21778205404462} is an apocalyptic number.

21778205404462 is a deficient number, since it is larger than the sum of its proper divisors (13403491683698).

21778205404462 is a wasteful number, since it uses less digits than its factorization.

21778205404462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36169707.

The product of its (nonzero) digits is 6021120, while the sum is 52.

The spelling of 21778205404462 in words is "twenty-one trillion, seven hundred seventy-eight billion, two hundred five million, four hundred four thousand, four hundred sixty-two".