4021331222421 has 16 divisors (see below), whose sum is σ = 6118542001600. Its totient is φ = 2608431062544.

The previous prime is 4021331222417. The next prime is 4021331222453. The reversal of 4021331222421 is 1242221331204.

4021331222421 is a `hidden beast` number, since 4 + 0 + 2 + 13 + 3 + 1 + 222 + 421 = 666.

It is not a de Polignac number, because 4021331222421 - 2² = 4021331222417 is a prime.

It is a super-2 number, since 2×4021331222421² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021331222221) 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, 2012677291 + ... + 2012679288.

It is an arithmetic number, because the mean of its divisors is an integer number (382408875100).

Almost surely, 2^{4021331222421} is an apocalyptic number.

It is an amenable number.

4021331222421 is a deficient number, since it is larger than the sum of its proper divisors (2097210779179).

4021331222421 is a wasteful number, since it uses less digits than its factorization.

4021331222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025356625 (or 4025356619 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 4021331222421 its reverse (1242221331204), we get a palindrome (5263552553625).

The spelling of 4021331222421 in words is "four trillion, twenty-one billion, three hundred thirty-one million, two hundred twenty-two thousand, four hundred twenty-one".