1021200111001 has 8 divisors (see below), whose sum is σ = 1167111137024. Its totient is φ = 875295408960.

The previous prime is 1021200110993. The next prime is 1021200111049. The reversal of 1021200111001 is 1001110021201.

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

It is not a de Polignac number, because 1021200111001 - 2³ = 1021200110993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021200111091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1229760 + ... + 1885393.

It is an arithmetic number, because the mean of its divisors is an integer number (145888892128).

Almost surely, 2^{1021200111001} is an apocalyptic number.

It is an amenable number.

1021200111001 is a deficient number, since it is larger than the sum of its proper divisors (145911026023).

1021200111001 is an equidigital number, since it uses as much as digits as its factorization.

1021200111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161991.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1021200111001 its reverse (1001110021201), we get a palindrome (2022310132202).

The spelling of 1021200111001 in words is "one trillion, twenty-one billion, two hundred million, one hundred eleven thousand, one".