21212310102 has 8 divisors (see below), whose sum is σ = 42424620216. Its totient is φ = 7070770032.

The previous prime is 21212310037. The next prime is 21212310103. The reversal of 21212310102 is 20101321212.

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

21212310102 is an admirable number.

It is a super-2 number, since 2×21212310102² (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 (21212310103) 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, 1767692503 + ... + 1767692514.

It is an arithmetic number, because the mean of its divisors is an integer number (5303077527).

Almost surely, 2^21212310102 is an apocalyptic number.

21212310102 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212310102 is a wasteful number, since it uses less digits than its factorization.

21212310102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535385022.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21212310102 its reverse (20101321212), we get a palindrome (41313631314).

The spelling of 21212310102 in words is "twenty-one billion, two hundred twelve million, three hundred ten thousand, one hundred two".