21124213002 has 48 divisors (see below), whose sum is σ = 47427120000. Its totient is φ = 6787146912.

The previous prime is 21124212997. The next prime is 21124213007. The reversal of 21124213002 is 20031242112.

It is a happy number.

21124213002 is a `hidden beast` number, since 211 + 2 + 421 + 30 + 0 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21124212997) and next prime (21124213007).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21124213007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 278899 + ... + 346457.

It is an arithmetic number, because the mean of its divisors is an integer number (988065000).

Almost surely, 2^21124213002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21124213002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23713560000).

21124213002 is an abundant number, since it is smaller than the sum of its proper divisors (26302906998).

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

21124213002 is a wasteful number, since it uses less digits than its factorization.

21124213002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68195 (or 68192 counting only the distinct ones).

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

Adding to 21124213002 its reverse (20031242112), we get a palindrome (41155455114).

The spelling of 21124213002 in words is "twenty-one billion, one hundred twenty-four million, two hundred thirteen thousand, two".