21101002212 has 12 divisors (see below), whose sum is σ = 49235671856. Its totient is φ = 7033667400.

The previous prime is 21101002199. The next prime is 21101002249. The reversal of 21101002212 is 21220010112.

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

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: 1758416851 = 21101002212 / (2 + 1 + 1 + 0 + 1 + 0 + 0 + 2 + 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, 879208414 + ... + 879208437.

Almost surely, 2^21101002212 is an apocalyptic number.

It is an amenable number.

21101002212 is an abundant number, since it is smaller than the sum of its proper divisors (28134669644).

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

21101002212 is a wasteful number, since it uses less digits than its factorization.

21101002212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758416858 (or 1758416856 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21101002212 its reverse (21220010112), we get a palindrome (42321012324).

The spelling of 21101002212 in words is "twenty-one billion, one hundred one million, two thousand, two hundred twelve".