21161003670 has 96 divisors (see below), whose sum is σ = 55358214912. Its totient is φ = 5608216896.

The previous prime is 21161003653. The next prime is 21161003671. The reversal of 21161003670 is 7630016112.

21161003670 is a `hidden beast` number, since 2 + 11 + 610 + 0 + 36 + 7 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161003671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13893529 + ... + 13895051.

It is an arithmetic number, because the mean of its divisors is an integer number (576648072).

Almost surely, 2^21161003670 is an apocalyptic number.

21161003670 is an abundant number, since it is smaller than the sum of its proper divisors (34197211242).

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

21161003670 is a wasteful number, since it uses less digits than its factorization.

21161003670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2383 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

Adding to 21161003670 its reverse (7630016112), we get a palindrome (28791019782).

The spelling of 21161003670 in words is "twenty-one billion, one hundred sixty-one million, three thousand, six hundred seventy".