223121030202021 has 16 divisors (see below), whose sum is σ = 339995118130304. Its totient is φ = 127497293789184.

The previous prime is 223121030202017. The next prime is 223121030202047. The reversal of 223121030202021 is 120202030121322.

It is not a de Polignac number, because 223121030202021 - 2² = 223121030202017 is a prime.

It is a super-3 number, since 3×223121030202021³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121030202001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11927020 + ... + 24258933.

It is an arithmetic number, because the mean of its divisors is an integer number (21249694883144).

Almost surely, 2^{223121030202021} is an apocalyptic number.

223121030202021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

223121030202021 is a deficient number, since it is larger than the sum of its proper divisors (116874087928283).

223121030202021 is a wasteful number, since it uses less digits than its factorization.

223121030202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36479580.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 223121030202021 its reverse (120202030121322), we get a palindrome (343323060323343).

The spelling of 223121030202021 in words is "two hundred twenty-three trillion, one hundred twenty-one billion, thirty million, two hundred two thousand, twenty-one".