21232126653641 has 4 divisors (see below), whose sum is σ = 21246067644432. Its totient is φ = 21218185662852.

The previous prime is 21232126653593. The next prime is 21232126653697. The reversal of 21232126653641 is 14635662123212.

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 21232126653641 - 2²⁶ = 21232059544777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232126653592 and 21232126653601.

It is not an unprimeable number, because it can be changed into a prime (21232126653841) 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, 6970493111 + ... + 6970496156.

It is an arithmetic number, because the mean of its divisors is an integer number (5311516911108).

Almost surely, 2^{21232126653641} is an apocalyptic number.

It is an amenable number.

21232126653641 is a deficient number, since it is larger than the sum of its proper divisors (13940990791).

21232126653641 is a wasteful number, since it uses less digits than its factorization.

21232126653641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13940990790.

The product of its digits is 622080, while the sum is 44.

Adding to 21232126653641 its reverse (14635662123212), we get a palindrome (35867788776853).

The spelling of 21232126653641 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred twenty-six million, six hundred fifty-three thousand, six hundred forty-one".