20421431220341 has 16 divisors (see below), whose sum is σ = 21387413940480. Its totient is φ = 19478634289920.

The previous prime is 20421431220299. The next prime is 20421431220373. The reversal of 20421431220341 is 14302213412402.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20421431220341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421431220041) 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, 3849431 + ... + 7460628.

It is an arithmetic number, because the mean of its divisors is an integer number (1336713371280).

Almost surely, 2^{20421431220341} is an apocalyptic number.

It is an amenable number.

20421431220341 is a deficient number, since it is larger than the sum of its proper divisors (965982720139).

20421431220341 is a wasteful number, since it uses less digits than its factorization.

20421431220341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11311084.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 20421431220341 its reverse (14302213412402), we get a palindrome (34723644632743).

The spelling of 20421431220341 in words is "twenty trillion, four hundred twenty-one billion, four hundred thirty-one million, two hundred twenty thousand, three hundred forty-one".