221102020021 has 8 divisors (see below), whose sum is σ = 222274596960. Its totient is φ = 219932431728.

The previous prime is 221102020003. The next prime is 221102020039. The reversal of 221102020021 is 120020201122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221102020003) and next prime (221102020039).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221102020021 - 2²³ = 221093631413 is a prime.

It is a super-2 number, since 2×221102020021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221102019983 and 221102020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102020001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598731 + ... + 894808.

It is an arithmetic number, because the mean of its divisors is an integer number (27784324620).

Almost surely, 2^221102020021 is an apocalyptic number.

It is an amenable number.

221102020021 is a deficient number, since it is larger than the sum of its proper divisors (1172576939).

221102020021 is a wasteful number, since it uses less digits than its factorization.

221102020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494323.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221102020021 its reverse (120020201122), we get a palindrome (341122221143).

The spelling of 221102020021 in words is "two hundred twenty-one billion, one hundred two million, twenty thousand, twenty-one".