2135907421 has 8 divisors (see below), whose sum is σ = 2262462840. Its totient is φ = 2009453568.

The previous prime is 2135907383. The next prime is 2135907451. The reversal of 2135907421 is 1247095312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1225980196 + 909927225 = 35014^2 + 30165^2 .

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 2135907421 - 2⁹ = 2135906909 is a prime.

It is a super-2 number, since 2×2135907421² = 9124201022165742482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135907451) 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, 20275 + ... + 68431.

It is an arithmetic number, because the mean of its divisors is an integer number (282807855).

Almost surely, 2^2135907421 is an apocalyptic number.

It is an amenable number.

2135907421 is a deficient number, since it is larger than the sum of its proper divisors (126555419).

2135907421 is a wasteful number, since it uses less digits than its factorization.

2135907421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50783.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 2135907421 is about 46215.8784510259. The cubic root of 2135907421 is about 1287.8367326855.

The spelling of 2135907421 in words is "two billion, one hundred thirty-five million, nine hundred seven thousand, four hundred twenty-one".