21093604642 has 64 divisors (see below), whose sum is σ = 37337448960. Its totient is φ = 8833795200.

The previous prime is 21093604639. The next prime is 21093604643. The reversal of 21093604642 is 24640639012.

It is a happy number.

It is a super-3 number, since 3×21093604642³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21093604643) 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 31 ways as a sum of consecutive naturals, for example, 5945113 + ... + 5948659.

It is an arithmetic number, because the mean of its divisors is an integer number (583397640).

Almost surely, 2^21093604642 is an apocalyptic number.

21093604642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21093604642 is a deficient number, since it is larger than the sum of its proper divisors (16243844318).

21093604642 is a wasteful number, since it uses less digits than its factorization.

21093604642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3967.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21093604642 in words is "twenty-one billion, ninety-three million, six hundred four thousand, six hundred forty-two".