20012121992 has 32 divisors (see below), whose sum is σ = 38068531200. Its totient is φ = 9861379584.

The previous prime is 20012121979. The next prime is 20012122007. The reversal of 20012121992 is 29912121002.

It is a super-3 number, since 3×20012121992³ (a number of 32 digits) contains 333 as substring.

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, 131513 + ... + 239415.

It is an arithmetic number, because the mean of its divisors is an integer number (1189641600).

Almost surely, 2^20012121992 is an apocalyptic number.

It is an amenable number.

20012121992 is a deficient number, since it is larger than the sum of its proper divisors (18056409208).

20012121992 is a wasteful number, since it uses less digits than its factorization.

20012121992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108245 (or 108241 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

Adding to 20012121992 its reverse (29912121002), we get a palindrome (49924242994).

The spelling of 20012121992 in words is "twenty billion, twelve million, one hundred twenty-one thousand, nine hundred ninety-two".