20413220406421 has 16 divisors (see below), whose sum is σ = 20975483440768. Its totient is φ = 19851515640000.

The previous prime is 20413220406419. The next prime is 20413220406457. The reversal of 20413220406421 is 12460402231402.

It is a cyclic number.

It is not a de Polignac number, because 20413220406421 - 2¹ = 20413220406419 is a prime.

It is a super-2 number, since 2×20413220406421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413220106421) 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, 683822146 + ... + 683851996.

It is an arithmetic number, because the mean of its divisors is an integer number (1310967715048).

Almost surely, 2^{20413220406421} is an apocalyptic number.

It is an amenable number.

20413220406421 is a deficient number, since it is larger than the sum of its proper divisors (562263034347).

20413220406421 is a wasteful number, since it uses less digits than its factorization.

20413220406421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38572.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 20413220406421 its reverse (12460402231402), we get a palindrome (32873622637823).

The spelling of 20413220406421 in words is "twenty trillion, four hundred thirteen billion, two hundred twenty million, four hundred six thousand, four hundred twenty-one".