20213121221212 has 48 divisors (see below), whose sum is σ = 37475147485440. Its totient is φ = 9519472904832.

The previous prime is 20213121221207. The next prime is 20213121221233. The reversal of 20213121221212 is 21212212131202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16794688 + ... + 17957944.

It is an arithmetic number, because the mean of its divisors is an integer number (780732239280).

Almost surely, 2^{20213121221212} is an apocalyptic number.

It is an amenable number.

20213121221212 is a deficient number, since it is larger than the sum of its proper divisors (17262026264228).

20213121221212 is a wasteful number, since it uses less digits than its factorization.

20213121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166170 (or 1166168 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 20213121221212 its reverse (21212212131202), we get a palindrome (41425333352414).

The spelling of 20213121221212 in words is "twenty trillion, two hundred thirteen billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".