21210330031 has 8 divisors (see below), whose sum is σ = 23763908304. Its totient is φ = 18760979520.

The previous prime is 21210330023. The next prime is 21210330047. The reversal of 21210330031 is 13003301212.

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 21210330031 - 2³ = 21210330023 is a prime.

It is a super-2 number, since 2×21210330031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21210329987 and 21210330014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210330131) 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, 26056510 + ... + 26057323.

It is an arithmetic number, because the mean of its divisors is an integer number (2970488538).

Almost surely, 2^21210330031 is an apocalyptic number.

21210330031 is a deficient number, since it is larger than the sum of its proper divisors (2553578273).

21210330031 is a wasteful number, since it uses less digits than its factorization.

21210330031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52113881.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21210330031 its reverse (13003301212), we get a palindrome (34213631243).

The spelling of 21210330031 in words is "twenty-one billion, two hundred ten million, three hundred thirty thousand, thirty-one".