21670338371672 has 128 divisors (see below), whose sum is σ = 42327119462400. Its totient is φ = 10392610572288.

The previous prime is 21670338371659. The next prime is 21670338371743. The reversal of 21670338371672 is 27617383307612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11887184153 + ... + 11887185975.

It is an arithmetic number, because the mean of its divisors is an integer number (330680620800).

Almost surely, 2^{21670338371672} is an apocalyptic number.

It is an amenable number.

21670338371672 is a deficient number, since it is larger than the sum of its proper divisors (20656781090728).

21670338371672 is a wasteful number, since it uses less digits than its factorization.

21670338371672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705 (or 3701 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 56.

The spelling of 21670338371672 in words is "twenty-one trillion, six hundred seventy billion, three hundred thirty-eight million, three hundred seventy-one thousand, six hundred seventy-two".