21121423240120 has 96 divisors (see below), whose sum is σ = 56776203262080. Its totient is φ = 7045911048960.

The previous prime is 21121423240097. The next prime is 21121423240153. The reversal of 21121423240120 is 2104232412112.

It is a super-2 number, since 2×21121423240120² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145552296 + ... + 145697335.

It is an arithmetic number, because the mean of its divisors is an integer number (591418783980).

Almost surely, 2^{21121423240120} is an apocalyptic number.

21121423240120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121423240120 is an abundant number, since it is smaller than the sum of its proper divisors (35654780021960).

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

21121423240120 is a wasteful number, since it uses less digits than its factorization.

21121423240120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291249693 (or 291249682 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 21121423240120 its reverse (2104232412112), we get a palindrome (23225655652232).

The spelling of 21121423240120 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred twenty-three million, two hundred forty thousand, one hundred twenty".