1021001211021 has 16 divisors (see below), whose sum is σ = 1485169807680. Its totient is φ = 618756472320.

The previous prime is 1021001210993. The next prime is 1021001211067. The reversal of 1021001211021 is 1201121001201.

It is not a de Polignac number, because 1021001211021 - 2¹¹ = 1021001208973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021001210988 and 1021001211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021001211071) 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, 150630 + ... + 1436903.

It is an arithmetic number, because the mean of its divisors is an integer number (92823112980).

Almost surely, 2^{1021001211021} is an apocalyptic number.

1021001211021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021001211021 is a deficient number, since it is larger than the sum of its proper divisors (464168596659).

1021001211021 is a wasteful number, since it uses less digits than its factorization.

1021001211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607036.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021001211021 its reverse (1201121001201), we get a palindrome (2222122212222).

The spelling of 1021001211021 in words is "one trillion, twenty-one billion, one million, two hundred eleven thousand, twenty-one".