21212010213 has 16 divisors (see below), whose sum is σ = 28405218816. Its totient is φ = 14080183920.

The previous prime is 21212010187. The next prime is 21212010217. The reversal of 21212010213 is 31201021212.

It is not a de Polignac number, because 21212010213 - 2¹² = 21212006117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212010192 and 21212010201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212010217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767920 + ... + 795062.

It is an arithmetic number, because the mean of its divisors is an integer number (1775326176).

Almost surely, 2^21212010213 is an apocalyptic number.

It is an amenable number.

21212010213 is a deficient number, since it is larger than the sum of its proper divisors (7193208603).

21212010213 is a wasteful number, since it uses less digits than its factorization.

21212010213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28264.

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

Adding to 21212010213 its reverse (31201021212), we get a palindrome (52413031425).

The spelling of 21212010213 in words is "twenty-one billion, two hundred twelve million, ten thousand, two hundred thirteen".