21523353511040 has 32 divisors (see below), whose sum is σ = 51454266988860. Its totient is φ = 8609341404160.

The previous prime is 21523353511003. The next prime is 21523353511073. The reversal of 21523353511040 is 4011535332512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17720260687936 + 3803092823104 = 4209544^2 + 1950152^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21523353511040² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16815119291 + ... + 16815120570.

Almost surely, 2^{21523353511040} is an apocalyptic number.

21523353511040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21523353511040 is an abundant number, since it is smaller than the sum of its proper divisors (29930913477820).

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

21523353511040 is an equidigital number, since it uses as much as digits as its factorization.

21523353511040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33630239880 (or 33630239868 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 21523353511040 its reverse (4011535332512), we get a palindrome (25534888843552).

The spelling of 21523353511040 in words is "twenty-one trillion, five hundred twenty-three billion, three hundred fifty-three million, five hundred eleven thousand, forty".