21110140140 has 48 divisors (see below), whose sum is σ = 61678326528. Its totient is φ = 5384615104.

The previous prime is 21110140127. The next prime is 21110140159. The reversal of 21110140140 is 4104101112.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 15 ways as a sum of consecutive naturals, for example, 7647222 + ... + 7649981.

It is an arithmetic number, because the mean of its divisors is an integer number (1284965136).

Almost surely, 2^21110140140 is an apocalyptic number.

21110140140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110140140 is an abundant number, since it is smaller than the sum of its proper divisors (40568186388).

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

21110140140 is a wasteful number, since it uses less digits than its factorization.

21110140140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15297238 (or 15297236 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21110140140 its reverse (4104101112), we get a palindrome (25214241252).

The spelling of 21110140140 in words is "twenty-one billion, one hundred ten million, one hundred forty thousand, one hundred forty".