20421121303452 has 24 divisors (see below), whose sum is σ = 47676937926016. Its totient is φ = 6803089736688.

The previous prime is 20421121303411. The next prime is 20421121303483. The reversal of 20421121303452 is 25430312112402.

It is a happy number.

It is a super-2 number, since 2×20421121303452² (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 7 ways as a sum of consecutive naturals, for example, 493815688 + ... + 493857039.

Almost surely, 2^{20421121303452} is an apocalyptic number.

It is an amenable number.

20421121303452 is an abundant number, since it is smaller than the sum of its proper divisors (27255816622564).

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

20421121303452 is a wasteful number, since it uses less digits than its factorization.

20421121303452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987674457 (or 987674455 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 20421121303452 its reverse (25430312112402), we get a palindrome (45851433415854).

The spelling of 20421121303452 in words is "twenty trillion, four hundred twenty-one billion, one hundred twenty-one million, three hundred three thousand, four hundred fifty-two".