1021000122021 has 16 divisors (see below), whose sum is σ = 1485147483648. Its totient is φ = 618764454000.

The previous prime is 1021000122001. The next prime is 1021000122031. The reversal of 1021000122021 is 1202210001201.

It is not a de Polignac number, because 1021000122021 - 2¹¹ = 1021000119973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021000121988 and 1021000122006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000122001) 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, 315390 + ... + 1463376.

It is an arithmetic number, because the mean of its divisors is an integer number (92821717728).

Almost surely, 2^{1021000122021} is an apocalyptic number.

1021000122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021000122021 is a deficient number, since it is larger than the sum of its proper divisors (464147361627).

1021000122021 is a wasteful number, since it uses less digits than its factorization.

1021000122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174952.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1021000122021 its reverse (1202210001201), we get a palindrome (2223210123222).

The spelling of 1021000122021 in words is "one trillion, twenty-one billion, one hundred twenty-two thousand, twenty-one".