221021211002021 has 4 divisors (see below), whose sum is σ = 221030859656832. Its totient is φ = 221011562347212.

The previous prime is 221021211001951. The next prime is 221021211002041. The reversal of 221021211002021 is 120200112120122.

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 221021211002021 - 2³⁸ = 220746333095077 is a prime.

It is a super-3 number, since 3×221021211002021³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021211002041) 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, 4824293045 + ... + 4824338858.

It is an arithmetic number, because the mean of its divisors is an integer number (55257714914208).

Almost surely, 2^{221021211002021} is an apocalyptic number.

It is an amenable number.

221021211002021 is a deficient number, since it is larger than the sum of its proper divisors (9648654811).

221021211002021 is an equidigital number, since it uses as much as digits as its factorization.

221021211002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9648654810.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221021211002021 its reverse (120200112120122), we get a palindrome (341221323122143).

The spelling of 221021211002021 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, two thousand, twenty-one".