21232444251445 has 24 divisors (see below), whose sum is σ = 29640355606584. Its totient is φ = 14558606004096.

The previous prime is 21232444251439. The next prime is 21232444251451. The reversal of 21232444251445 is 54415244423212.

It is an interprime number because it is at equal distance from previous prime (21232444251439) and next prime (21232444251451).

It can be written as a sum of positive squares in 4 ways, for example, as 1213253784484 + 20019190466961 = 1101478^2 + 4474281^2 .

It is not a de Polignac number, because 21232444251445 - 2¹³ = 21232444243253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2241039 + ... + 6891091.

It is an arithmetic number, because the mean of its divisors is an integer number (1235014816941).

Almost surely, 2^{21232444251445} is an apocalyptic number.

It is an amenable number.

21232444251445 is a deficient number, since it is larger than the sum of its proper divisors (8407911355139).

21232444251445 is a wasteful number, since it uses less digits than its factorization.

21232444251445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668709 (or 4668702 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 43.

Adding to 21232444251445 its reverse (54415244423212), we get a palindrome (75647688674657).

The spelling of 21232444251445 in words is "twenty-one trillion, two hundred thirty-two billion, four hundred forty-four million, two hundred fifty-one thousand, four hundred forty-five".