20421240152120 has 32 divisors (see below), whose sum is σ = 45949580298720. Its totient is φ = 8168177846400.

The previous prime is 20421240152107. The next prime is 20421240152143. The reversal of 20421240152120 is 2125104212402.

It is a self number, because there is not a number n which added to its sum of digits gives 20421240152120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8903231 + ... + 10959470.

It is an arithmetic number, because the mean of its divisors is an integer number (1435924384335).

Almost surely, 2^{20421240152120} is an apocalyptic number.

20421240152120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20421240152120 is an abundant number, since it is smaller than the sum of its proper divisors (25528340146600).

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

20421240152120 is a wasteful number, since it uses less digits than its factorization.

20421240152120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19888415 (or 19888411 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 20421240152120 its reverse (2125104212402), we get a palindrome (22546344364522).

The spelling of 20421240152120 in words is "twenty trillion, four hundred twenty-one billion, two hundred forty million, one hundred fifty-two thousand, one hundred twenty".