13651234021 has 4 divisors (see below), whose sum is σ = 13652065152. Its totient is φ = 13650402892.

The previous prime is 13651233979. The next prime is 13651234031. The reversal of 13651234021 is 12043215631.

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 13651234021 - 2¹⁵ = 13651201253 is a prime.

It is a super-2 number, since 2×13651234021² (a number of 21 digits) 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 (13651234031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390421 + ... + 423946.

It is an arithmetic number, because the mean of its divisors is an integer number (3413016288).

Almost surely, 2^13651234021 is an apocalyptic number.

It is an amenable number.

13651234021 is a deficient number, since it is larger than the sum of its proper divisors (831131).

13651234021 is an equidigital number, since it uses as much as digits as its factorization.

13651234021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831130.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 13651234021 its reverse (12043215631), we get a palindrome (25694449652).

The spelling of 13651234021 in words is "thirteen billion, six hundred fifty-one million, two hundred thirty-four thousand, twenty-one".