21544322231452 has 24 divisors (see below), whose sum is σ = 37761425942240. Its totient is φ = 10755350691840.

The previous prime is 21544322231431. The next prime is 21544322231479. The reversal of 21544322231452 is 25413222344512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10923052 + ... + 12743692.

Almost surely, 2^{21544322231452} is an apocalyptic number.

It is an amenable number.

21544322231452 is a deficient number, since it is larger than the sum of its proper divisors (16217103710788).

21544322231452 is a wasteful number, since it uses less digits than its factorization.

21544322231452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825261 (or 1825259 counting only the distinct ones).

The product of its digits is 460800, while the sum is 40.

Adding to 21544322231452 its reverse (25413222344512), we get a palindrome (46957544575964).

The spelling of 21544322231452 in words is "twenty-one trillion, five hundred forty-four billion, three hundred twenty-two million, two hundred thirty-one thousand, four hundred fifty-two".