402403423421021 has 8 divisors (see below), whose sum is σ = 441260089368384. Its totient is φ = 363925846897920.

The previous prime is 402403423421011. The next prime is 402403423421057. The reversal of 402403423421021 is 120124324304204.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402403423421021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402403423421011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94772353841 + ... + 94772358086.

It is an arithmetic number, because the mean of its divisors is an integer number (55157511171048).

Almost surely, 2^{402403423421021} is an apocalyptic number.

It is an amenable number.

402403423421021 is a deficient number, since it is larger than the sum of its proper divisors (38856665947363).

402403423421021 is a wasteful number, since it uses less digits than its factorization.

402403423421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189544712131.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 402403423421021 its reverse (120124324304204), we get a palindrome (522527747725225).

The spelling of 402403423421021 in words is "four hundred two trillion, four hundred three billion, four hundred twenty-three million, four hundred twenty-one thousand, twenty-one".