1020120221021 has 4 divisors (see below), whose sum is σ = 1112858422944. Its totient is φ = 927382019100.

The previous prime is 1020120220963. The next prime is 1020120221083. The reversal of 1020120221021 is 1201220210201.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020120221021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020120220987 and 1020120221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020120221321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46369100945 + ... + 46369100966.

It is an arithmetic number, because the mean of its divisors is an integer number (278214605736).

Almost surely, 2^{1020120221021} is an apocalyptic number.

1020120221021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1020120221021 is a deficient number, since it is larger than the sum of its proper divisors (92738201923).

1020120221021 is an equidigital number, since it uses as much as digits as its factorization.

1020120221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92738201922.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020120221021 its reverse (1201220210201), we get a palindrome (2221340431222).

The spelling of 1020120221021 in words is "one trillion, twenty billion, one hundred twenty million, two hundred twenty-one thousand, twenty-one".