402122443421 has 4 divisors (see below), whose sum is σ = 402220263744. Its totient is φ = 402024623100.

The previous prime is 402122443403. The next prime is 402122443423. The reversal of 402122443421 is 124344221204.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 402122443421 - 2⁶ = 402122443357 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 (402122443423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48903995 + ... + 48912216.

It is an arithmetic number, because the mean of its divisors is an integer number (100555065936).

Almost surely, 2^402122443421 is an apocalyptic number.

It is an amenable number.

402122443421 is a deficient number, since it is larger than the sum of its proper divisors (97820323).

402122443421 is an equidigital number, since it uses as much as digits as its factorization.

402122443421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97820322.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 402122443421 its reverse (124344221204), we get a palindrome (526466664625).

The spelling of 402122443421 in words is "four hundred two billion, one hundred twenty-two million, four hundred forty-three thousand, four hundred twenty-one".