20121111101012 has 6 divisors (see below), whose sum is σ = 35211944426778. Its totient is φ = 10060555550504.

The previous prime is 20121111101011. The next prime is 20121111101129. The reversal of 20121111101012 is 21010111112102.

It can be written as a sum of positive squares in only one way, i.e., 18384920119696 + 1736190981316 = 4287764^2 + 1317646^2 .

It is a super-2 number, since 2×20121111101012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121111101011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2515138887623 + ... + 2515138887630.

It is an arithmetic number, because the mean of its divisors is an integer number (5868657404463).

Almost surely, 2^{20121111101012} is an apocalyptic number.

It is an amenable number.

20121111101012 is a deficient number, since it is larger than the sum of its proper divisors (15090833325766).

20121111101012 is a wasteful number, since it uses less digits than its factorization.

20121111101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5030277775257 (or 5030277775255 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20121111101012 its reverse (21010111112102), we get a palindrome (41131222213114).

The spelling of 20121111101012 in words is "twenty trillion, one hundred twenty-one billion, one hundred eleven million, one hundred one thousand, twelve".