1021222020021 has 32 divisors (see below), whose sum is σ = 1567363565568. Its totient is φ = 579357178560.

The previous prime is 1021222020019. The next prime is 1021222020031. The reversal of 1021222020021 is 1200202221201.

It is not a de Polignac number, because 1021222020021 - 2¹ = 1021222020019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222020001) 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 31 ways as a sum of consecutive naturals, for example, 3062520 + ... + 3379566.

It is an arithmetic number, because the mean of its divisors is an integer number (48980111424).

Almost surely, 2^{1021222020021} is an apocalyptic number.

It is an amenable number.

1021222020021 is a deficient number, since it is larger than the sum of its proper divisors (546141545547).

1021222020021 is a wasteful number, since it uses less digits than its factorization.

1021222020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318161.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1021222020021 its reverse (1200202221201), we get a palindrome (2221424241222).

The spelling of 1021222020021 in words is "one trillion, twenty-one billion, two hundred twenty-two million, twenty thousand, twenty-one".