2135721469 has 4 divisors (see below), whose sum is σ = 2440824544. Its totient is φ = 1830618396.

The previous prime is 2135721433. The next prime is 2135721473. The reversal of 2135721469 is 9641275312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2135721469 - 2¹⁵ = 2135688701 is a prime.

It is a super-2 number, since 2×2135721469² = 9122612386295035922, 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 (2135721479) 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, 152551527 + ... + 152551540.

It is an arithmetic number, because the mean of its divisors is an integer number (610206136).

Almost surely, 2^2135721469 is an apocalyptic number.

It is an amenable number.

2135721469 is a deficient number, since it is larger than the sum of its proper divisors (305103075).

2135721469 is an equidigital number, since it uses as much as digits as its factorization.

2135721469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305103074.

The product of its digits is 90720, while the sum is 40.

The square root of 2135721469 is about 46213.8666311314. The cubic root of 2135721469 is about 1287.7993585990.

The spelling of 2135721469 in words is "two billion, one hundred thirty-five million, seven hundred twenty-one thousand, four hundred sixty-nine".