23001221421 has 24 divisors (see below), whose sum is σ = 34133868600. Its totient is φ = 14914492416.

The previous prime is 23001221417. The next prime is 23001221431. The reversal of 23001221421 is 12412210032.

It is a happy number.

23001221421 is a `hidden beast` number, since 23 + 0 + 0 + 1 + 221 + 421 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18765164196 + 4236057225 = 136986^2 + 65085^2 .

It is not a de Polignac number, because 23001221421 - 2² = 23001221417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23001221394 and 23001221403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23001221431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1092805 + ... + 1113653.

It is an arithmetic number, because the mean of its divisors is an integer number (1422244525).

Almost surely, 2^23001221421 is an apocalyptic number.

It is an amenable number.

23001221421 is a deficient number, since it is larger than the sum of its proper divisors (11132647179).

23001221421 is a wasteful number, since it uses less digits than its factorization.

23001221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24205 (or 24202 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 23001221421 its reverse (12412210032), we get a palindrome (35413431453).

The spelling of 23001221421 in words is "twenty-three billion, one million, two hundred twenty-one thousand, four hundred twenty-one".