1021200111021 has 16 divisors (see below), whose sum is σ = 1455453820800. Its totient is φ = 635317140480.

The previous prime is 1021200110993. The next prime is 1021200111049. The reversal of 1021200111021 is 1201110021201.

1021200111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1021200110993) and next prime (1021200111049).

It is not a de Polignac number, because 1021200111021 - 2³³ = 1012610176429 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021200110988 and 1021200111006.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180484996 + ... + 180490653.

It is an arithmetic number, because the mean of its divisors is an integer number (90965863800).

Almost surely, 2^{1021200111021} is an apocalyptic number.

It is an amenable number.

1021200111021 is a deficient number, since it is larger than the sum of its proper divisors (434253709779).

1021200111021 is a wasteful number, since it uses less digits than its factorization.

1021200111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360975716.

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

Adding to 1021200111021 its reverse (1201110021201), we get a palindrome (2222310132222).

The spelling of 1021200111021 in words is "one trillion, twenty-one billion, two hundred million, one hundred eleven thousand, twenty-one".