21212101012 has 12 divisors (see below), whose sum is σ = 37125164160. Its totient is φ = 10604911256.

The previous prime is 21212100983. The next prime is 21212101039. The reversal of 21212101012 is 21010121212.

21212101012 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-3 number, since 3×21212101012³ (a number of 32 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21212100983 and 21212101001.

It is a congruent number.

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, 242212 + ... + 317947.

It is an arithmetic number, because the mean of its divisors is an integer number (3093763680).

Almost surely, 2^21212101012 is an apocalyptic number.

It is an amenable number.

21212101012 is a deficient number, since it is larger than the sum of its proper divisors (15913063148).

21212101012 is a wasteful number, since it uses less digits than its factorization.

21212101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569630 (or 569628 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21212101012 its reverse (21010121212), we get a palindrome (42222222224).

The spelling of 21212101012 in words is "twenty-one billion, two hundred twelve million, one hundred one thousand, twelve".