21136525642 has 8 divisors (see below), whose sum is σ = 33373461600. Its totient is φ = 10012038444.

The previous prime is 21136525639. The next prime is 21136525667. The reversal of 21136525642 is 24652563112.

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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278112142 + ... + 278112217.

It is an arithmetic number, because the mean of its divisors is an integer number (4171682700).

Almost surely, 2^21136525642 is an apocalyptic number.

21136525642 is a deficient number, since it is larger than the sum of its proper divisors (12236935958).

21136525642 is a wasteful number, since it uses less digits than its factorization.

21136525642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556224380.

The product of its digits is 86400, while the sum is 37.

The spelling of 21136525642 in words is "twenty-one billion, one hundred thirty-six million, five hundred twenty-five thousand, six hundred forty-two".