209192043426 has 32 divisors (see below), whose sum is σ = 420863509248. Its totient is φ = 69317752320.

The previous prime is 209192043397. The next prime is 209192043433. The reversal of 209192043426 is 624340291902.

It is a super-2 number, since 2×209192043426² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2778855 + ... + 2853141.

It is an arithmetic number, because the mean of its divisors is an integer number (13151984664).

Almost surely, 2^209192043426 is an apocalyptic number.

209192043426 is an abundant number, since it is smaller than the sum of its proper divisors (211671465822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209192043426 is a wasteful number, since it uses less digits than its factorization.

209192043426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77066.

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 209192043426 in words is "two hundred nine billion, one hundred ninety-two million, forty-three thousand, four hundred twenty-six".