1020121231111 has 8 divisors (see below), whose sum is σ = 1025115041664. Its totient is φ = 1015137708000.

The previous prime is 1020121231099. The next prime is 1020121231121. The reversal of 1020121231111 is 1111321210201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020121231111 - 2¹³ = 1020121222919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020121231121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2373015 + ... + 2769736.

It is an arithmetic number, because the mean of its divisors is an integer number (128139380208).

Almost surely, 2^{1020121231111} is an apocalyptic number.

1020121231111 is a deficient number, since it is larger than the sum of its proper divisors (4993810553).

1020121231111 is an equidigital number, since it uses as much as digits as its factorization.

1020121231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143721.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1020121231111 its reverse (1111321210201), we get a palindrome (2131442441312).

The spelling of 1020121231111 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, one hundred eleven".