231212222021 has 8 divisors (see below), whose sum is σ = 254728857888. Its totient is φ = 208111810000.

The previous prime is 231212222011. The next prime is 231212222027. The reversal of 231212222021 is 120222212132.

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 231212222021 - 2⁶ = 231212221957 is a prime.

It is a super-2 number, since 2×231212222021² (a number of 24 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 = 231212221984 and 231212222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231212222027) 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, 104054795 + ... + 104057016.

It is an arithmetic number, because the mean of its divisors is an integer number (31841107236).

Almost surely, 2^231212222021 is an apocalyptic number.

It is an amenable number.

231212222021 is a deficient number, since it is larger than the sum of its proper divisors (23516635867).

231212222021 is a wasteful number, since it uses less digits than its factorization.

231212222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208111923.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 231212222021 its reverse (120222212132), we get a palindrome (351434434153).

The spelling of 231212222021 in words is "two hundred thirty-one billion, two hundred twelve million, two hundred twenty-two thousand, twenty-one".