21121020122212 has 12 divisors (see below), whose sum is σ = 36962303479920. Its totient is φ = 10560361985096.

The previous prime is 21121020122183. The next prime is 21121020122233. The reversal of 21121020122212 is 21222102012112.

It is a self number, because there is not a number n which added to its sum of digits gives 21121020122212.

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, 36697762 + ... + 37268857.

It is an arithmetic number, because the mean of its divisors is an integer number (3080191956660).

Almost surely, 2^{21121020122212} is an apocalyptic number.

It is an amenable number.

21121020122212 is a deficient number, since it is larger than the sum of its proper divisors (15841283357708).

21121020122212 is a wasteful number, since it uses less digits than its factorization.

21121020122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74038010 (or 74038008 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21121020122212 its reverse (21222102012112), we get a palindrome (42343122134324).

The spelling of 21121020122212 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, one hundred twenty-two thousand, two hundred twelve".