21001010111212 has 12 divisors (see below), whose sum is σ = 37216979944480. Its totient is φ = 10367587269936.

The previous prime is 21001010111209. The next prime is 21001010111233. The reversal of 21001010111212 is 21211101010012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21001010111192 and 21001010111201.

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, 33229446063 + ... + 33229446694.

Almost surely, 2^{21001010111212} is an apocalyptic number.

It is an amenable number.

21001010111212 is a deficient number, since it is larger than the sum of its proper divisors (16215969833268).

21001010111212 is a wasteful number, since it uses less digits than its factorization.

21001010111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66458892840 (or 66458892838 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001010111212 its reverse (21211101010012), we get a palindrome (42212111121224).

The spelling of 21001010111212 in words is "twenty-one trillion, one billion, ten million, one hundred eleven thousand, two hundred twelve".