201997212406 has 8 divisors (see below), whose sum is σ = 330540893064. Its totient is φ = 91816914720.

The previous prime is 201997212401. The next prime is 201997212409. The reversal of 201997212406 is 604212799102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201997212401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4590845715 + ... + 4590845758.

It is an arithmetic number, because the mean of its divisors is an integer number (41317611633).

Almost surely, 2^201997212406 is an apocalyptic number.

201997212406 is a deficient number, since it is larger than the sum of its proper divisors (128543680658).

201997212406 is a wasteful number, since it uses less digits than its factorization.

201997212406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9181691486.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 201997212406 in words is "two hundred one billion, nine hundred ninety-seven million, two hundred twelve thousand, four hundred six".