21030444402 has 32 divisors (see below), whose sum is σ = 47466838080. Its totient is φ = 6153107520.

The previous prime is 21030444401. The next prime is 21030444437. The reversal of 21030444402 is 20444403012.

It is a happy number.

It is a super-2 number, since 2×21030444402² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21030444401) 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 15 ways as a sum of consecutive naturals, for example, 5491933 + ... + 5495760.

It is an arithmetic number, because the mean of its divisors is an integer number (1483338690).

Almost surely, 2^21030444402 is an apocalyptic number.

21030444402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21030444402 is an abundant number, since it is smaller than the sum of its proper divisors (26436393678).

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

21030444402 is a wasteful number, since it uses less digits than its factorization.

21030444402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10987738.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21030444402 its reverse (20444403012), we get a palindrome (41474847414).

The spelling of 21030444402 in words is "twenty-one billion, thirty million, four hundred forty-four thousand, four hundred two".