21210101012 has 12 divisors (see below), whose sum is σ = 37234769460. Its totient is φ = 10571595456.

The previous prime is 21210100993. The next prime is 21210101041. The reversal of 21210101012 is 21010101212.

21210101012 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 2 ways, for example, as 1126676356 + 20083424656 = 33566^2 + 141716^2 .

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 = 21210100984 and 21210101002.

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, 8362337 + ... + 8364872.

It is an arithmetic number, because the mean of its divisors is an integer number (3102897455).

Almost surely, 2^21210101012 is an apocalyptic number.

It is an amenable number.

21210101012 is a deficient number, since it is larger than the sum of its proper divisors (16024668448).

21210101012 is a wasteful number, since it uses less digits than its factorization.

21210101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16727530 (or 16727528 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21210101012 its reverse (21010101212), we get a palindrome (42220202224).

The spelling of 21210101012 in words is "twenty-one billion, two hundred ten million, one hundred one thousand, twelve".