21030010212 has 12 divisors (see below), whose sum is σ = 49070023856. Its totient is φ = 7010003400.

The previous prime is 21030010207. The next prime is 21030010229. The reversal of 21030010212 is 21201003012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21030010212² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 1752500851 = 21030010212 / (2 + 1 + 0 + 3 + 0 + 0 + 1 + 0 + 2 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876250414 + ... + 876250437.

Almost surely, 2^21030010212 is an apocalyptic number.

It is an amenable number.

21030010212 is an abundant number, since it is smaller than the sum of its proper divisors (28040013644).

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

21030010212 is a wasteful number, since it uses less digits than its factorization.

21030010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752500858 (or 1752500856 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21030010212 its reverse (21201003012), we get a palindrome (42231013224).

The spelling of 21030010212 in words is "twenty-one billion, thirty million, ten thousand, two hundred twelve".