20120021192 has 8 divisors (see below), whose sum is σ = 37725039750. Its totient is φ = 10060010592.

The previous prime is 20120021191. The next prime is 20120021293. The reversal of 20120021192 is 29112002102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10808929156 + 9311092036 = 103966^2 + 96494^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20120021191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257501317 + ... + 1257501332.

Almost surely, 2^20120021192 is an apocalyptic number.

It is an amenable number.

20120021192 is a deficient number, since it is larger than the sum of its proper divisors (17605018558).

20120021192 is a wasteful number, since it uses less digits than its factorization.

20120021192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515002655 (or 2515002651 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20120021192 its reverse (29112002102), we get a palindrome (49232023294).

The spelling of 20120021192 in words is "twenty billion, one hundred twenty million, twenty-one thousand, one hundred ninety-two".