10211221111021 has 4 divisors (see below), whose sum is σ = 11669966984032. Its totient is φ = 8752475238012.

The previous prime is 10211221110977. The next prime is 10211221111051. The reversal of 10211221111021 is 12011112211201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10211221111021 - 2¹⁹ = 10211220586733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10211221110986 and 10211221111004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211221111051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729372936495 + ... + 729372936508.

It is an arithmetic number, because the mean of its divisors is an integer number (2917491746008).

Almost surely, 2^{10211221111021} is an apocalyptic number.

It is an amenable number.

10211221111021 is a deficient number, since it is larger than the sum of its proper divisors (1458745873011).

10211221111021 is an equidigital number, since it uses as much as digits as its factorization.

10211221111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458745873010.

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

Adding to 10211221111021 its reverse (12011112211201), we get a palindrome (22222333322222).

The spelling of 10211221111021 in words is "ten trillion, two hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, twenty-one".