21211231310 has 8 divisors (see below), whose sum is σ = 38180216376. Its totient is φ = 8484492520.

The previous prime is 21211231259. The next prime is 21211231319. The reversal of 21211231310 is 1313211212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21211231310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211231319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060561556 + ... + 1060561575.

It is an arithmetic number, because the mean of its divisors is an integer number (4772527047).

Almost surely, 2^21211231310 is an apocalyptic number.

21211231310 is a deficient number, since it is larger than the sum of its proper divisors (16968985066).

21211231310 is a wasteful number, since it uses less digits than its factorization.

21211231310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121123138.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21211231310 its reverse (1313211212), we get a palindrome (22524442522).

The spelling of 21211231310 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, three hundred ten".