21212111301 has 48 divisors (see below), whose sum is σ = 30572484480. Its totient is φ = 13076976640.

The previous prime is 21212111257. The next prime is 21212111321. The reversal of 21212111301 is 10311121212.

It is not a de Polignac number, because 21212111301 - 2¹⁰ = 21212110277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212111321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31332175 + ... + 31332851.

It is an arithmetic number, because the mean of its divisors is an integer number (636926760).

Almost surely, 2^21212111301 is an apocalyptic number.

It is an amenable number.

21212111301 is a deficient number, since it is larger than the sum of its proper divisors (9360373179).

21212111301 is a wasteful number, since it uses less digits than its factorization.

21212111301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21212111301 its reverse (10311121212), we get a palindrome (31523232513).

The spelling of 21212111301 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, three hundred one".