210131023221 has 36 divisors (see below), whose sum is σ = 353141298432. Its totient is φ = 120053105424.

The previous prime is 210131023213. The next prime is 210131023307. The reversal of 210131023221 is 122320131012.

210131023221 is a `hidden beast` number, since 2 + 101 + 310 + 232 + 21 = 666.

It is not a de Polignac number, because 210131023221 - 2³ = 210131023213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210131023194 and 210131023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210131027221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2571820 + ... + 2652266.

It is an arithmetic number, because the mean of its divisors is an integer number (9809480512).

Almost surely, 2^210131023221 is an apocalyptic number.

210131023221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210131023221 is a deficient number, since it is larger than the sum of its proper divisors (143010275211).

210131023221 is a wasteful number, since it uses less digits than its factorization.

210131023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86390 (or 86380 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 210131023221 its reverse (122320131012), we get a palindrome (332451154233).

The spelling of 210131023221 in words is "two hundred ten billion, one hundred thirty-one million, twenty-three thousand, two hundred twenty-one".