1021201012021 has 8 divisors (see below), whose sum is σ = 1021656302424. Its totient is φ = 1020745824000.

The previous prime is 1021201011991. The next prime is 1021201012049. The reversal of 1021201012021 is 1202101021201.

It can be written as a sum of positive squares in 4 ways, for example, as 310122016996 + 711078995025 = 556886^2 + 843255^2 .

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 1021201012021 - 2¹³ = 1021201003829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021201011992 and 1021201012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021201042021) 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, 25134295 + ... + 25174891.

It is an arithmetic number, because the mean of its divisors is an integer number (127707037803).

Almost surely, 2^{1021201012021} is an apocalyptic number.

It is an amenable number.

1021201012021 is a deficient number, since it is larger than the sum of its proper divisors (455290403).

1021201012021 is an equidigital number, since it uses as much as digits as its factorization.

1021201012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51191.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021201012021 its reverse (1202101021201), we get a palindrome (2223302033222).

The spelling of 1021201012021 in words is "one trillion, twenty-one billion, two hundred one million, twelve thousand, twenty-one".