21030102212 has 96 divisors (see below), whose sum is σ = 45063438336. Its totient is φ = 8382528000.

The previous prime is 21030102211. The next prime is 21030102227. The reversal of 21030102212 is 21220103012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21030102211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20009087 + ... + 20010137.

It is an arithmetic number, because the mean of its divisors is an integer number (469410816).

Almost surely, 2^21030102212 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 21030102212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22531719168).

21030102212 is an abundant number, since it is smaller than the sum of its proper divisors (24033336124).

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

21030102212 is a wasteful number, since it uses less digits than its factorization.

21030102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1535 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21030102212 its reverse (21220103012), we get a palindrome (42250205224).

The spelling of 21030102212 in words is "twenty-one billion, thirty million, one hundred two thousand, two hundred twelve".