21000210021212 has 24 divisors (see below), whose sum is σ = 38924250057504. Its totient is φ = 9879379725312.

The previous prime is 21000210021163. The next prime is 21000210021251. The reversal of 21000210021212 is 21212001200012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47780408 + ... + 48217919.

It is an arithmetic number, because the mean of its divisors is an integer number (1621843752396).

Almost surely, 2^{21000210021212} is an apocalyptic number.

It is an amenable number.

21000210021212 is a deficient number, since it is larger than the sum of its proper divisors (17924040036292).

21000210021212 is a wasteful number, since it uses less digits than its factorization.

21000210021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96001565 (or 96001563 counting only the distinct ones).

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

Adding to 21000210021212 its reverse (21212001200012), we get a palindrome (42212211221224).

The spelling of 21000210021212 in words is "twenty-one trillion, two hundred ten million, twenty-one thousand, two hundred twelve".