21606325642 has 16 divisors (see below), whose sum is σ = 35493386112. Its totient is φ = 9782840320.

The previous prime is 21606325633. The next prime is 21606325709. The reversal of 21606325642 is 24652360612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1905058 + ... + 1916365.

It is an arithmetic number, because the mean of its divisors is an integer number (2218336632).

Almost surely, 2^21606325642 is an apocalyptic number.

21606325642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21606325642 is a deficient number, since it is larger than the sum of its proper divisors (13887060470).

21606325642 is a wasteful number, since it uses less digits than its factorization.

21606325642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3821693.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21606325642 in words is "twenty-one billion, six hundred six million, three hundred twenty-five thousand, six hundred forty-two".