21312101210 has 8 divisors (see below), whose sum is σ = 38361782196. Its totient is φ = 8524840480.

The previous prime is 21312101141. The next prime is 21312101219. The reversal of 21312101210 is 1210121312.

It can be written as a sum of positive squares in 2 ways, for example, as 21207223129 + 104878081 = 145627^2 + 10241^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21312101219) 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, 1065605051 + ... + 1065605070.

Almost surely, 2^21312101210 is an apocalyptic number.

21312101210 is a deficient number, since it is larger than the sum of its proper divisors (17049680986).

21312101210 is a wasteful number, since it uses less digits than its factorization.

21312101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131210128.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21312101210 its reverse (1210121312), we get a palindrome (22522222522).

The spelling of 21312101210 in words is "twenty-one billion, three hundred twelve million, one hundred one thousand, two hundred ten".