21423002301252 has 240 divisors, whose sum is σ = 64106292983040. Its totient is φ = 6195120288768.

The previous prime is 21423002301251. The next prime is 21423002301293. The reversal of 21423002301252 is 25210320032412.

21423002301252 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 300 + 2 + 301 + 2 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21423002301251) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1105813 + ... + 6638435.

It is an arithmetic number, because the mean of its divisors is an integer number (267109554096).

Almost surely, 2^{21423002301252} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423002301252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32053146491520).

21423002301252 is an abundant number, since it is smaller than the sum of its proper divisors (42683290681788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423002301252 is a wasteful number, since it uses less digits than its factorization.

21423002301252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532712 (or 5532701 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21423002301252 its reverse (25210320032412), we get a palindrome (46633322333664).

The spelling of 21423002301252 in words is "twenty-one trillion, four hundred twenty-three billion, two million, three hundred one thousand, two hundred fifty-two".