4021221012431 has 4 divisors (see below), whose sum is σ = 4595681157072. Its totient is φ = 3446760867792.

The previous prime is 4021221012427. The next prime is 4021221012481. The reversal of 4021221012431 is 1342101221204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4021221012431 - 2² = 4021221012427 is a prime.

It is a super-2 number, since 2×4021221012431² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4021221012397 and 4021221012406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021221012481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287230072310 + ... + 287230072323.

It is an arithmetic number, because the mean of its divisors is an integer number (1148920289268).

Almost surely, 2^{4021221012431} is an apocalyptic number.

4021221012431 is a deficient number, since it is larger than the sum of its proper divisors (574460144641).

4021221012431 is an equidigital number, since it uses as much as digits as its factorization.

4021221012431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574460144640.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 4021221012431 its reverse (1342101221204), we get a palindrome (5363322233635).

The spelling of 4021221012431 in words is "four trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, four hundred thirty-one".