196709385789021 has 16 divisors (see below), whose sum is σ = 312780141379584. Its totient is φ = 107518173598704.

The previous prime is 196709385789001. The next prime is 196709385789031. The reversal of 196709385789021 is 120987583907691.

It is not a de Polignac number, because 196709385789021 - 2²² = 196709381594717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196709385789001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203632904061 + ... + 203632905026.

It is an arithmetic number, because the mean of its divisors is an integer number (19548758836224).

Almost surely, 2^{196709385789021} is an apocalyptic number.

It is an amenable number.

196709385789021 is a deficient number, since it is larger than the sum of its proper divisors (116070755590563).

196709385789021 is a wasteful number, since it uses less digits than its factorization.

196709385789021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407265809120.

The product of its (nonzero) digits is 411505920, while the sum is 75.

The spelling of 196709385789021 in words is "one hundred ninety-six trillion, seven hundred nine billion, three hundred eighty-five million, seven hundred eighty-nine thousand, twenty-one".