21124991270 has 16 divisors (see below), whose sum is σ = 39052687248. Its totient is φ = 8221618080.

The previous prime is 21124991257. The next prime is 21124991341. The reversal of 21124991270 is 7219942112.

It is a super-3 number, since 3×21124991270³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 28546916 + ... + 28547655.

It is an arithmetic number, because the mean of its divisors is an integer number (2440792953).

Almost surely, 2^21124991270 is an apocalyptic number.

21124991270 is a deficient number, since it is larger than the sum of its proper divisors (17927695978).

21124991270 is a wasteful number, since it uses less digits than its factorization.

21124991270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57094615.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 21124991270 in words is "twenty-one billion, one hundred twenty-four million, nine hundred ninety-one thousand, two hundred seventy".