21353412040 has 32 divisors (see below), whose sum is σ = 48511644480. Its totient is φ = 8458437312.

The previous prime is 21353412023. The next prime is 21353412043. The reversal of 21353412040 is 4021435312.

It is a junction number, because it is equal to n+sod(n) for n = 21353411996 and 21353412014.

It is not an unprimeable number, because it can be changed into a prime (21353412043) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2587314 + ... + 2595553.

It is an arithmetic number, because the mean of its divisors is an integer number (1515988890).

Almost surely, 2^21353412040 is an apocalyptic number.

21353412040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21353412040 is an abundant number, since it is smaller than the sum of its proper divisors (27158232440).

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

21353412040 is a wasteful number, since it uses less digits than its factorization.

21353412040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182981 (or 5182977 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21353412040 its reverse (4021435312), we get a palindrome (25374847352).

The spelling of 21353412040 in words is "twenty-one billion, three hundred fifty-three million, four hundred twelve thousand, forty".