21111055561112 has 32 divisors (see below), whose sum is σ = 43320552537600. Its totient is φ = 9565079239200.

The previous prime is 21111055561069. The next prime is 21111055561129. The reversal of 21111055561112 is 21116555011112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385661312 + ... + 385716047.

It is an arithmetic number, because the mean of its divisors is an integer number (1353767266800).

Almost surely, 2^{21111055561112} is an apocalyptic number.

21111055561112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21111055561112 is an abundant number, since it is smaller than the sum of its proper divisors (22209496976488).

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

21111055561112 is a wasteful number, since it uses less digits than its factorization.

21111055561112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771377687 (or 771377683 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 32.

The spelling of 21111055561112 in words is "twenty-one trillion, one hundred eleven billion, fifty-five million, five hundred sixty-one thousand, one hundred twelve".