1021221102021 has 4 divisors (see below), whose sum is σ = 1361628136032. Its totient is φ = 680814068012.

The previous prime is 1021221102019. The next prime is 1021221102023. The reversal of 1021221102021 is 1202011221201.

1021221102021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1021221102019) and next prime (1021221102023).

It is a cyclic number.

It is not a de Polignac number, because 1021221102021 - 2¹ = 1021221102019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221102023) 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, 170203517001 + ... + 170203517006.

It is an arithmetic number, because the mean of its divisors is an integer number (340407034008).

Almost surely, 2^{1021221102021} is an apocalyptic number.

It is an amenable number.

1021221102021 is a deficient number, since it is larger than the sum of its proper divisors (340407034011).

1021221102021 is an equidigital number, since it uses as much as digits as its factorization.

1021221102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340407034010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021221102021 its reverse (1202011221201), we get a palindrome (2223232323222).

The spelling of 1021221102021 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred two thousand, twenty-one".