21121701116 has 12 divisors (see below), whose sum is σ = 36979635000. Its totient is φ = 10556091120.

The previous prime is 21121701103. The next prime is 21121701131. The reversal of 21121701116 is 61110712112.

It is a super-2 number, since 2×21121701116² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121701091 and 21121701100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1179866 + ... + 1197633.

It is an arithmetic number, because the mean of its divisors is an integer number (3081636250).

Almost surely, 2^21121701116 is an apocalyptic number.

It is an amenable number.

21121701116 is a deficient number, since it is larger than the sum of its proper divisors (15857933884).

21121701116 is a wasteful number, since it uses less digits than its factorization.

21121701116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379724 (or 2379722 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 23.

The spelling of 21121701116 in words is "twenty-one billion, one hundred twenty-one million, seven hundred one thousand, one hundred sixteen".