21001104212 has 12 divisors (see below), whose sum is σ = 40093017216. Its totient is φ = 9545956440.

The previous prime is 21001104211. The next prime is 21001104227. The reversal of 21001104212 is 21240110012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001104211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238648868 + ... + 238648955.

It is an arithmetic number, because the mean of its divisors is an integer number (3341084768).

Almost surely, 2^21001104212 is an apocalyptic number.

21001104212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001104212 is a deficient number, since it is larger than the sum of its proper divisors (19091913004).

21001104212 is a wasteful number, since it uses less digits than its factorization.

21001104212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477297838 (or 477297836 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001104212 its reverse (21240110012), we get a palindrome (42241214224).

The spelling of 21001104212 in words is "twenty-one billion, one million, one hundred four thousand, two hundred twelve".