21111121292 has 12 divisors (see below), whose sum is σ = 36945887160. Its totient is φ = 10555153536.

The previous prime is 21111121289. The next prime is 21111121301. The reversal of 21111121292 is 29212111112.

It is a happy 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, 35459 + ... + 208517.

It is an arithmetic number, because the mean of its divisors is an integer number (3078823930).

Almost surely, 2^21111121292 is an apocalyptic number.

It is an amenable number.

21111121292 is a deficient number, since it is larger than the sum of its proper divisors (15834765868).

21111121292 is a wasteful number, since it uses less digits than its factorization.

21111121292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203560 (or 203558 counting only the distinct ones).

The product of its digits is 144, while the sum is 23.

The spelling of 21111121292 in words is "twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, two hundred ninety-two".