20200121212 has 24 divisors (see below), whose sum is σ = 35612626896. Its totient is φ = 10025244288.

The previous prime is 20200121209. The next prime is 20200121261. The reversal of 20200121212 is 21212100202.

It is a happy number.

20200121212 is a modest number, since divided by 121212 gives 20200 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20200121192 and 20200121201.

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, 500208 + ... + 539080.

It is an arithmetic number, because the mean of its divisors is an integer number (1483859454).

Almost surely, 2^20200121212 is an apocalyptic number.

It is an amenable number.

20200121212 is a deficient number, since it is larger than the sum of its proper divisors (15412505684).

20200121212 is a wasteful number, since it uses less digits than its factorization.

20200121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39837 (or 39835 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20200121212 its reverse (21212100202), we get a palindrome (41412221414).

The spelling of 20200121212 in words is "twenty billion, two hundred million, one hundred twenty-one thousand, two hundred twelve".