1021220121021 has 16 divisors (see below), whose sum is σ = 1421226216960. Its totient is φ = 651030312240.

The previous prime is 1021220121013. The next prime is 1021220121023. The reversal of 1021220121021 is 1201210221201.

It is not a de Polignac number, because 1021220121021 - 2³ = 1021220121013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021220121023) 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, 1825891 + ... + 2318688.

It is an arithmetic number, because the mean of its divisors is an integer number (88826638560).

Almost surely, 2^{1021220121021} is an apocalyptic number.

It is an amenable number.

1021220121021 is a deficient number, since it is larger than the sum of its proper divisors (400006095939).

1021220121021 is a wasteful number, since it uses less digits than its factorization.

1021220121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148176.

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

Adding to 1021220121021 its reverse (1201210221201), we get a palindrome (2222430342222).

The spelling of 1021220121021 in words is "one trillion, twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".