21244105552 has 10 divisors (see below), whose sum is σ = 41160454538. Its totient is φ = 10622052768.

The previous prime is 21244105543. The next prime is 21244105567. The reversal of 21244105552 is 25550144212.

It can be written as a sum of positive squares in only one way, i.e., 12459917376 + 8784188176 = 111624^2 + 93724^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663878283 + ... + 663878314.

Almost surely, 2^21244105552 is an apocalyptic number.

It is an amenable number.

21244105552 is a deficient number, since it is larger than the sum of its proper divisors (19916348986).

21244105552 is a wasteful number, since it uses less digits than its factorization.

21244105552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327756605 (or 1327756599 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 21244105552 its reverse (25550144212), we get a palindrome (46794249764).

The spelling of 21244105552 in words is "twenty-one billion, two hundred forty-four million, one hundred five thousand, five hundred fifty-two".