21014022040 has 128 divisors (see below), whose sum is σ = 55106438400. Its totient is φ = 7131041280.

The previous prime is 21014021969. The next prime is 21014022053. The reversal of 21014022040 is 4022041012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 541362 + ... + 578878.

It is an arithmetic number, because the mean of its divisors is an integer number (430519050).

Almost surely, 2^21014022040 is an apocalyptic number.

21014022040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21014022040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27553219200).

21014022040 is an abundant number, since it is smaller than the sum of its proper divisors (34092416360).

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

21014022040 is a wasteful number, since it uses less digits than its factorization.

21014022040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37625 (or 37621 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21014022040 its reverse (4022041012), we get a palindrome (25036063052).

The spelling of 21014022040 in words is "twenty-one billion, fourteen million, twenty-two thousand, forty".