21210121121012 has 24 divisors (see below), whose sum is σ = 37720784462592. Its totient is φ = 10433814480000.

The previous prime is 21210121121009. The next prime is 21210121121029. The reversal of 21210121121012 is 21012112101212.

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, 132463364 + ... + 132623387.

It is an arithmetic number, because the mean of its divisors is an integer number (1571699352608).

Almost surely, 2^{21210121121012} is an apocalyptic number.

It is an amenable number.

21210121121012 is a deficient number, since it is larger than the sum of its proper divisors (16510663341580).

21210121121012 is a wasteful number, since it uses less digits than its factorization.

21210121121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265087079 (or 265087077 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21210121121012 its reverse (21012112101212), we get a palindrome (42222233222224).

The spelling of 21210121121012 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, one hundred twenty-one thousand, twelve".