20121231201124 has 6 divisors (see below), whose sum is σ = 35212154601974. Its totient is φ = 10060615600560.

The previous prime is 20121231201119. The next prime is 20121231201143. The reversal of 20121231201124 is 42110213212102.

It can be written as a sum of positive squares in only one way, i.e., 17536982047524 + 2584249153600 = 4187718^2 + 1607560^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20121231201095 and 20121231201104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2515153900137 + ... + 2515153900144.

Almost surely, 2^{20121231201124} is an apocalyptic number.

It is an amenable number.

20121231201124 is a deficient number, since it is larger than the sum of its proper divisors (15090923400850).

20121231201124 is a wasteful number, since it uses less digits than its factorization.

20121231201124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030307800285 (or 5030307800283 counting only the distinct ones).

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

Adding to 20121231201124 its reverse (42110213212102), we get a palindrome (62231444413226).

The spelling of 20121231201124 in words is "twenty trillion, one hundred twenty-one billion, two hundred thirty-one million, two hundred one thousand, one hundred twenty-four".