21052532553 has 16 divisors (see below), whose sum is σ = 30655046016. Its totient is φ = 12772932480.

The previous prime is 21052532549. The next prime is 21052532563. The reversal of 21052532553 is 35523525012.

It is not a de Polignac number, because 21052532553 - 2² = 21052532549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21052532563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3798700 + ... + 3804237.

It is an arithmetic number, because the mean of its divisors is an integer number (1915940376).

Almost surely, 2^21052532553 is an apocalyptic number.

It is an amenable number.

21052532553 is a deficient number, since it is larger than the sum of its proper divisors (9602513463).

21052532553 is a wasteful number, since it uses less digits than its factorization.

21052532553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7603024.

The product of its (nonzero) digits is 45000, while the sum is 33.

The spelling of 21052532553 in words is "twenty-one billion, fifty-two million, five hundred thirty-two thousand, five hundred fifty-three".