21040414240 has 48 divisors (see below), whose sum is σ = 51311473920. Its totient is φ = 8144674560.

The previous prime is 21040414229. The next prime is 21040414247. The reversal of 21040414240 is 4241404012.

It is not an unprimeable number, because it can be changed into a prime (21040414247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2116050 + ... + 2125969.

It is an arithmetic number, because the mean of its divisors is an integer number (1068989040).

Almost surely, 2^21040414240 is an apocalyptic number.

21040414240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21040414240 is an abundant number, since it is smaller than the sum of its proper divisors (30271059680).

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

21040414240 is a wasteful number, since it uses less digits than its factorization.

21040414240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242065 (or 4242057 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21040414240 its reverse (4241404012), we get a palindrome (25281818252).

The spelling of 21040414240 in words is "twenty-one billion, forty million, four hundred fourteen thousand, two hundred forty".