21101442421240 has 64 divisors (see below), whose sum is σ = 49364743744800. Its totient is φ = 8108154367488.

The previous prime is 21101442421229. The next prime is 21101442421247. The reversal of 21101442421240 is 4212424410112.

It is a junction number, because it is equal to n+sod(n) for n = 21101442421199 and 21101442421208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101442421247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45941274 + ... + 46398313.

Almost surely, 2^{21101442421240} is an apocalyptic number.

21101442421240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101442421240 is an abundant number, since it is smaller than the sum of its proper divisors (28263301323560).

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

21101442421240 is a wasteful number, since it uses less digits than its factorization.

21101442421240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92339824 (or 92339820 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 21101442421240 its reverse (4212424410112), we get a palindrome (25313866831352).

The spelling of 21101442421240 in words is "twenty-one trillion, one hundred one billion, four hundred forty-two million, four hundred twenty-one thousand, two hundred forty".