21167670642 has 32 divisors (see below), whose sum is σ = 42885024000. Its totient is φ = 6964334208.

The previous prime is 21167670631. The next prime is 21167670787. The reversal of 21167670642 is 24607676112.

It is a junction number, because it is equal to n+sod(n) for n = 21167670594 and 21167670603.

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 15 ways as a sum of consecutive naturals, for example, 2151318 + ... + 2161134.

It is an arithmetic number, because the mean of its divisors is an integer number (1340157000).

Almost surely, 2^21167670642 is an apocalyptic number.

21167670642 is an abundant number, since it is smaller than the sum of its proper divisors (21717353358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21167670642 is a wasteful number, since it uses less digits than its factorization.

21167670642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14450.

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 21167670642 in words is "twenty-one billion, one hundred sixty-seven million, six hundred seventy thousand, six hundred forty-two".