1020200212021 has 4 divisors (see below), whose sum is σ = 1020276376812. Its totient is φ = 1020124047232.

The previous prime is 1020200212007. The next prime is 1020200212027. The reversal of 1020200212021 is 1202120020201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120141958225 + 900058253796 = 346615^2 + 948714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020200212021 - 2⁹ = 1020200211509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020200211992 and 1020200212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020200212027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38062300 + ... + 38089093.

It is an arithmetic number, because the mean of its divisors is an integer number (255069094203).

Almost surely, 2^{1020200212021} is an apocalyptic number.

It is an amenable number.

1020200212021 is a deficient number, since it is larger than the sum of its proper divisors (76164791).

1020200212021 is an equidigital number, since it uses as much as digits as its factorization.

1020200212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76164790.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1020200212021 its reverse (1202120020201), we get a palindrome (2222320232222).

The spelling of 1020200212021 in words is "one trillion, twenty billion, two hundred million, two hundred twelve thousand, twenty-one".