20100123212 has 48 divisors (see below), whose sum is σ = 38835320832. Its totient is φ = 9044784960.

The previous prime is 20100123193. The next prime is 20100123257. The reversal of 20100123212 is 21232100102.

It is a happy 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, 627137 + ... + 658407.

It is an arithmetic number, because the mean of its divisors is an integer number (809069184).

Almost surely, 2^20100123212 is an apocalyptic number.

It is an amenable number.

20100123212 is a deficient number, since it is larger than the sum of its proper divisors (18735197620).

20100123212 is a wasteful number, since it uses less digits than its factorization.

20100123212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31598 (or 31596 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20100123212 its reverse (21232100102), we get a palindrome (41332223314).

The spelling of 20100123212 in words is "twenty billion, one hundred million, one hundred twenty-three thousand, two hundred twelve".