21012011213 has 8 divisors (see below), whose sum is σ = 22119801600. Its totient is φ = 19904410368.

The previous prime is 21012011191. The next prime is 21012011221. The reversal of 21012011213 is 31211021012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012011213 - 2¹² = 21012007117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012016213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218468 + ... + 299586.

It is an arithmetic number, because the mean of its divisors is an integer number (2764975200).

Almost surely, 2^21012011213 is an apocalyptic number.

It is an amenable number.

21012011213 is a deficient number, since it is larger than the sum of its proper divisors (1107790387).

21012011213 is a wasteful number, since it uses less digits than its factorization.

21012011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94771.

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

Adding to 21012011213 its reverse (31211021012), we get a palindrome (52223032225).

The spelling of 21012011213 in words is "twenty-one billion, twelve million, eleven thousand, two hundred thirteen".