21111051140 has 12 divisors (see below), whose sum is σ = 44333207436. Its totient is φ = 8444420448.

The previous prime is 21111051131. The next prime is 21111051211. The reversal of 21111051140 is 4115011112.

It can be written as a sum of positive squares in 2 ways, for example, as 2870387776 + 18240663364 = 53576^2 + 135058^2 .

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, 527776259 + ... + 527776298.

It is an arithmetic number, because the mean of its divisors is an integer number (3694433953).

Almost surely, 2^21111051140 is an apocalyptic number.

21111051140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111051140 is an abundant number, since it is smaller than the sum of its proper divisors (23222156296).

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

21111051140 is a wasteful number, since it uses less digits than its factorization.

21111051140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055552566 (or 1055552564 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 21111051140 its reverse (4115011112), we get a palindrome (25226062252).

The spelling of 21111051140 in words is "twenty-one billion, one hundred eleven million, fifty-one thousand, one hundred forty".