423040120021 has 16 divisors (see below), whose sum is σ = 432135285120. Its totient is φ = 413987595840.

The previous prime is 423040120003. The next prime is 423040120037. The reversal of 423040120021 is 120021040324.

It is not a de Polignac number, because 423040120021 - 2¹⁹ = 423039595733 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 (423040120421) 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, 35654536 + ... + 35666398.

It is an arithmetic number, because the mean of its divisors is an integer number (27008455320).

Almost surely, 2^423040120021 is an apocalyptic number.

It is an amenable number.

423040120021 is a deficient number, since it is larger than the sum of its proper divisors (9095165099).

423040120021 is a wasteful number, since it uses less digits than its factorization.

423040120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13596.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 423040120021 its reverse (120021040324), we get a palindrome (543061160345).

The spelling of 423040120021 in words is "four hundred twenty-three billion, forty million, one hundred twenty thousand, twenty-one".