21652506554 has 8 divisors (see below), whose sum is σ = 37118582688. Its totient is φ = 9279645660.

The previous prime is 21652506539. The next prime is 21652506581. The reversal of 21652506554 is 45560525612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 773303792 + ... + 773303819.

It is an arithmetic number, because the mean of its divisors is an integer number (4639822836).

Almost surely, 2^21652506554 is an apocalyptic number.

21652506554 is a deficient number, since it is larger than the sum of its proper divisors (15466076134).

21652506554 is a wasteful number, since it uses less digits than its factorization.

21652506554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546607620.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 21652506554 in words is "twenty-one billion, six hundred fifty-two million, five hundred six thousand, five hundred fifty-four".