1011221010021 has 12 divisors (see below), whose sum is σ = 1356937343232. Its totient is φ = 669853358928.

The previous prime is 1011221009969. The next prime is 1011221010049. The reversal of 1011221010021 is 1200101221101.

It is not a de Polignac number, because 1011221010021 - 2⁷ = 1011221009893 is a prime.

It is a super-2 number, since 2×1011221010021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1011221009979 and 1011221010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221010061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6763525 + ... + 6911418.

It is an arithmetic number, because the mean of its divisors is an integer number (113078111936).

Almost surely, 2^{1011221010021} is an apocalyptic number.

It is an amenable number.

1011221010021 is a deficient number, since it is larger than the sum of its proper divisors (345716333211).

1011221010021 is an equidigital number, since it uses as much as digits as its factorization.

1011221010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13675260 (or 13675103 counting only the distinct ones).

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

Adding to 1011221010021 its reverse (1200101221101), we get a palindrome (2211322231122).

The spelling of 1011221010021 in words is "one trillion, eleven billion, two hundred twenty-one million, ten thousand, twenty-one".