1011221001021 has 64 divisors (see below), whose sum is σ = 1735760166912. Its totient is φ = 508204800000.

The previous prime is 1011221000921. The next prime is 1011221001023. The reversal of 1011221001021 is 1201001221101.

It is not a de Polignac number, because 1011221001021 - 2¹⁵ = 1011220968253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011221000988 and 1011221001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221001023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24763821 + ... + 24804621.

It is an arithmetic number, because the mean of its divisors is an integer number (27121252608).

Almost surely, 2^{1011221001021} is an apocalyptic number.

1011221001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011221001021 is a deficient number, since it is larger than the sum of its proper divisors (724539165891).

1011221001021 is a wasteful number, since it uses less digits than its factorization.

1011221001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44314.

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

Adding to 1011221001021 its reverse (1201001221101), we get a palindrome (2212222222122).

The spelling of 1011221001021 in words is "one trillion, eleven billion, two hundred twenty-one million, one thousand, twenty-one".