21022102012 has 12 divisors (see below), whose sum is σ = 38952718560. Its totient is φ = 9892753856.

The previous prime is 21022102009. The next prime is 21022102019. The reversal of 21022102012 is 21020122012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21022101983 and 21022102001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022102019) 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, 154574212 + ... + 154574347.

It is an arithmetic number, because the mean of its divisors is an integer number (3246059880).

Almost surely, 2^21022102012 is an apocalyptic number.

It is an amenable number.

21022102012 is a deficient number, since it is larger than the sum of its proper divisors (17930616548).

21022102012 is a wasteful number, since it uses less digits than its factorization.

21022102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309148580 (or 309148578 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022102012 its reverse (21020122012), we get a palindrome (42042224024).

The spelling of 21022102012 in words is "twenty-one billion, twenty-two million, one hundred two thousand, twelve".