21113001337 has 2 divisors, whose sum is σ = 21113001338. Its totient is φ = 21113001336.

The previous prime is 21113001307. The next prime is 21113001347. The reversal of 21113001337 is 73310031112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20850204816 + 262796521 = 144396^2 + 16211^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113001337 - 2¹⁹ = 21112477049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113001307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556500668 + 10556500669.

It is an arithmetic number, because the mean of its divisors is an integer number (10556500669).

Almost surely, 2^21113001337 is an apocalyptic number.

It is an amenable number.

21113001337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113001337 is an equidigital number, since it uses as much as digits as its factorization.

21113001337 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

Adding to 21113001337 its reverse (73310031112), we get a palindrome (94423032449).

The spelling of 21113001337 in words is "twenty-one billion, one hundred thirteen million, one thousand, three hundred thirty-seven".