21152450534 has 16 divisors (see below), whose sum is σ = 33881569920. Its totient is φ = 9882122880.

The previous prime is 21152450509. The next prime is 21152450551. The reversal of 21152450534 is 43505425112.

It is a self number, because there is not a number n which added to its sum of digits gives 21152450534.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 5880419 + ... + 5884014.

It is an arithmetic number, because the mean of its divisors is an integer number (2117598120).

Almost surely, 2^21152450534 is an apocalyptic number.

21152450534 is a deficient number, since it is larger than the sum of its proper divisors (12729119386).

21152450534 is a wasteful number, since it uses less digits than its factorization.

21152450534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11764495.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21152450534 its reverse (43505425112), we get a palindrome (64657875646).

The spelling of 21152450534 in words is "twenty-one billion, one hundred fifty-two million, four hundred fifty thousand, five hundred thirty-four".