21210102031 has 8 divisors (see below), whose sum is σ = 21440453904. Its totient is φ = 20980845120.

The previous prime is 21210102019. The next prime is 21210102061. The reversal of 21210102031 is 13020101212.

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 21210102031 - 2⁷ = 21210101903 is a prime.

It is a super-2 number, since 2×21210102031² (a number of 21 digits) contains 22 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 (21210102061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234760 + ... + 312301.

It is an arithmetic number, because the mean of its divisors is an integer number (2680056738).

Almost surely, 2^21210102031 is an apocalyptic number.

21210102031 is a deficient number, since it is larger than the sum of its proper divisors (230351873).

21210102031 is a wasteful number, since it uses less digits than its factorization.

21210102031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547481.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210102031 its reverse (13020101212), we get a palindrome (34230203243).

The spelling of 21210102031 in words is "twenty-one billion, two hundred ten million, one hundred two thousand, thirty-one".