21001312202213 has 16 divisors (see below), whose sum is σ = 25210904365056. Its totient is φ = 17104437543600.

The previous prime is 21001312202207. The next prime is 21001312202237. The reversal of 21001312202213 is 31220221310012.

It is a cyclic number.

It is not a de Polignac number, because 21001312202213 - 2¹⁸ = 21001311940069 is a prime.

It is a super-2 number, since 2×21001312202213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001312502213) 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, 431905931 + ... + 431954552.

It is an arithmetic number, because the mean of its divisors is an integer number (1575681522816).

Almost surely, 2^{21001312202213} is an apocalyptic number.

21001312202213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21001312202213 is a deficient number, since it is larger than the sum of its proper divisors (4209592162843).

21001312202213 is a wasteful number, since it uses less digits than its factorization.

21001312202213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863860664.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21001312202213 its reverse (31220221310012), we get a palindrome (52221533512225).

The spelling of 21001312202213 in words is "twenty-one trillion, one billion, three hundred twelve million, two hundred two thousand, two hundred thirteen".