21121114808 has 8 divisors (see below), whose sum is σ = 39602090280. Its totient is φ = 10560557400.

The previous prime is 21121114793. The next prime is 21121114811. The reversal of 21121114808 is 80841112112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21121114808² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320069668 + ... + 1320069683.

It is an arithmetic number, because the mean of its divisors is an integer number (4950261285).

Almost surely, 2^21121114808 is an apocalyptic number.

It is an amenable number.

21121114808 is a deficient number, since it is larger than the sum of its proper divisors (18480975472).

21121114808 is a wasteful number, since it uses less digits than its factorization.

21121114808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640139357 (or 2640139353 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The spelling of 21121114808 in words is "twenty-one billion, one hundred twenty-one million, one hundred fourteen thousand, eight hundred eight".