2135907921 has 8 divisors (see below), whose sum is σ = 3254716864. Its totient is φ = 1220518800.

The previous prime is 2135907887. The next prime is 2135907923. The reversal of 2135907921 is 1297095312.

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

It is not a de Polignac number, because 2135907921 - 2¹¹ = 2135905873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2135907921.

It is not an unprimeable number, because it can be changed into a prime (2135907923) 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, 50854930 + ... + 50854971.

It is an arithmetic number, because the mean of its divisors is an integer number (406839608).

Almost surely, 2^2135907921 is an apocalyptic number.

2135907921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2135907921 is a deficient number, since it is larger than the sum of its proper divisors (1118808943).

2135907921 is a wasteful number, since it uses less digits than its factorization.

2135907921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101709911.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 2135907921 is about 46215.8838604218. The cubic root of 2135907921 is about 1287.8368331765.

The spelling of 2135907921 in words is "two billion, one hundred thirty-five million, nine hundred seven thousand, nine hundred twenty-one".