424002121021 has 4 divisors (see below), whose sum is σ = 442436995872. Its totient is φ = 405567246172.

The previous prime is 424002121003. The next prime is 424002121043. The reversal of 424002121021 is 120121200424.

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 424002121021 - 2²¹ = 424000023869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 424002121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424002121061) 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, 9217437391 + ... + 9217437436.

It is an arithmetic number, because the mean of its divisors is an integer number (110609248968).

Almost surely, 2^424002121021 is an apocalyptic number.

It is an amenable number.

424002121021 is a deficient number, since it is larger than the sum of its proper divisors (18434874851).

424002121021 is a wasteful number, since it uses less digits than its factorization.

424002121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18434874850.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 424002121021 its reverse (120121200424), we get a palindrome (544123321445).

The spelling of 424002121021 in words is "four hundred twenty-four billion, two million, one hundred twenty-one thousand, twenty-one".