21401033240 has 32 divisors (see below), whose sum is σ = 49060864080. Its totient is φ = 8398895232.

The previous prime is 21401033237. The next prime is 21401033279. The reversal of 21401033240 is 4233010412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5045294 + ... + 5049533.

Almost surely, 2^21401033240 is an apocalyptic number.

21401033240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21401033240 is an abundant number, since it is smaller than the sum of its proper divisors (27659830840).

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

21401033240 is a wasteful number, since it uses less digits than its factorization.

21401033240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10094891 (or 10094887 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21401033240 its reverse (4233010412), we get a palindrome (25634043652).

The spelling of 21401033240 in words is "twenty-one billion, four hundred one million, thirty-three thousand, two hundred forty".