21423632344121 has 32 divisors (see below), whose sum is σ = 25893920640000. Its totient is φ = 17315053584192.

The previous prime is 21423632344111. The next prime is 21423632344157. The reversal of 21423632344121 is 12144323632412.

It is a happy number.

It is not a de Polignac number, because 21423632344121 - 2⁶ = 21423632344057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423632344111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24968210 + ... + 25811988.

It is an arithmetic number, because the mean of its divisors is an integer number (809185020000).

Almost surely, 2^{21423632344121} is an apocalyptic number.

It is an amenable number.

21423632344121 is a deficient number, since it is larger than the sum of its proper divisors (4470288295879).

21423632344121 is a wasteful number, since it uses less digits than its factorization.

21423632344121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844701.

The product of its digits is 165888, while the sum is 38.

Adding to 21423632344121 its reverse (12144323632412), we get a palindrome (33567955976533).

The spelling of 21423632344121 in words is "twenty-one trillion, four hundred twenty-three billion, six hundred thirty-two million, three hundred forty-four thousand, one hundred twenty-one".