1200111021021 has 48 divisors (see below), whose sum is σ = 1797104477952. Its totient is φ = 711531047040.

The previous prime is 1200111021019. The next prime is 1200111021029. The reversal of 1200111021021 is 1201201110021.

It is not a de Polignac number, because 1200111021021 - 2¹ = 1200111021019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200111020988 and 1200111021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111021029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39105535 + ... + 39136211.

It is an arithmetic number, because the mean of its divisors is an integer number (37439676624).

Almost surely, 2^{1200111021021} is an apocalyptic number.

1200111021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200111021021 is a deficient number, since it is larger than the sum of its proper divisors (596993456931).

1200111021021 is a wasteful number, since it uses less digits than its factorization.

1200111021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33042 (or 33031 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1200111021021 its reverse (1201201110021), we get a palindrome (2401312131042).

The spelling of 1200111021021 in words is "one trillion, two hundred billion, one hundred eleven million, twenty-one thousand, twenty-one".