21536610254 has 8 divisors (see below), whose sum is σ = 32308230240. Its totient is φ = 10767200176.

The previous prime is 21536610229. The next prime is 21536610283. The reversal of 21536610254 is 45201663512.

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

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 3 ways as a sum of consecutive naturals, for example, 527894 + ... + 567225.

It is an arithmetic number, because the mean of its divisors is an integer number (4038528780).

Almost surely, 2^21536610254 is an apocalyptic number.

21536610254 is a deficient number, since it is larger than the sum of its proper divisors (10771619986).

21536610254 is a wasteful number, since it uses less digits than its factorization.

21536610254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104954.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21536610254 in words is "twenty-one billion, five hundred thirty-six million, six hundred ten thousand, two hundred fifty-four".