209771211604 has 24 divisors (see below), whose sum is σ = 368525845856. Its totient is φ = 104478660000.

The previous prime is 209771211541. The next prime is 209771211631. The reversal of 209771211604 is 406112177902.

It is a super-2 number, since 2×209771211604² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1482754 + ... + 1618054.

Almost surely, 2^209771211604 is an apocalyptic number.

It is an amenable number.

209771211604 is a deficient number, since it is larger than the sum of its proper divisors (158754634252).

209771211604 is a wasteful number, since it uses less digits than its factorization.

209771211604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136807 (or 136805 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The spelling of 209771211604 in words is "two hundred nine billion, seven hundred seventy-one million, two hundred eleven thousand, six hundred four".