2135521997 has 8 divisors (see below), whose sum is σ = 2584161216. Its totient is φ = 1722773952.

The previous prime is 2135521957. The next prime is 2135522041. The reversal of 2135521997 is 7991255312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2135521997 - 2¹⁴ = 2135505613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135521907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8972663 + ... + 8972900.

It is an arithmetic number, because the mean of its divisors is an integer number (323020152).

Almost surely, 2^2135521997 is an apocalyptic number.

It is an amenable number.

2135521997 is a deficient number, since it is larger than the sum of its proper divisors (448639219).

2135521997 is a wasteful number, since it uses less digits than its factorization.

2135521997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17945587.

The product of its digits is 170100, while the sum is 44.

The square root of 2135521997 is about 46211.7084406106. The cubic root of 2135521997 is about 1287.7592647455.

The spelling of 2135521997 in words is "two billion, one hundred thirty-five million, five hundred twenty-one thousand, nine hundred ninety-seven".