21374452120552 has 8 divisors (see below), whose sum is σ = 40077097726050. Its totient is φ = 10687226060272.

The previous prime is 21374452120537. The next prime is 21374452120627. The reversal of 21374452120552 is 25502125447312.

It can be written as a sum of positive squares in only one way, i.e., 18181133156356 + 3193318964196 = 4263934^2 + 1786986^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21374452120499 and 21374452120508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335903257527 + ... + 1335903257542.

Almost surely, 2^{21374452120552} is an apocalyptic number.

It is an amenable number.

21374452120552 is a deficient number, since it is larger than the sum of its proper divisors (18702645605498).

21374452120552 is a wasteful number, since it uses less digits than its factorization.

21374452120552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671806515075 (or 2671806515071 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 43.

Adding to 21374452120552 its reverse (25502125447312), we get a palindrome (46876577567864).

The spelling of 21374452120552 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred fifty-two million, one hundred twenty thousand, five hundred fifty-two".