20412403221 has 16 divisors (see below), whose sum is σ = 31614528128. Its totient is φ = 11473012800.

The previous prime is 20412403177. The next prime is 20412403241. The reversal of 20412403221 is 12230421402.

It is not a de Polignac number, because 20412403221 - 2¹⁴ = 20412386837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412403241) 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, 7966090 + ... + 7968651.

It is an arithmetic number, because the mean of its divisors is an integer number (1975908008).

Almost surely, 2^20412403221 is an apocalyptic number.

20412403221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20412403221 is a deficient number, since it is larger than the sum of its proper divisors (11202124907).

20412403221 is a wasteful number, since it uses less digits than its factorization.

20412403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15934812.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20412403221 its reverse (12230421402), we get a palindrome (32642824623).

The spelling of 20412403221 in words is "twenty billion, four hundred twelve million, four hundred three thousand, two hundred twenty-one".