423420213151221 has 96 divisors (see below), whose sum is σ = 682869234015360. Its totient is φ = 229939228569600.

The previous prime is 423420213151081. The next prime is 423420213151261. The reversal of 423420213151221 is 122151312024324.

It is not a de Polignac number, because 423420213151221 - 2²² = 423420208956917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423420213151261) 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 95 ways as a sum of consecutive naturals, for example, 696238045 + ... + 696845933.

It is an arithmetic number, because the mean of its divisors is an integer number (7113221187660).

Almost surely, 2^{423420213151221} is an apocalyptic number.

423420213151221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

423420213151221 is a deficient number, since it is larger than the sum of its proper divisors (259449020864139).

423420213151221 is a wasteful number, since it uses less digits than its factorization.

423420213151221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608355 (or 608156 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 423420213151221 its reverse (122151312024324), we get a palindrome (545571525175545).

The spelling of 423420213151221 in words is "four hundred twenty-three trillion, four hundred twenty billion, two hundred thirteen million, one hundred fifty-one thousand, two hundred twenty-one".