21121300007 has 2 divisors, whose sum is σ = 21121300008. Its totient is φ = 21121300006.

The previous prime is 21121300003. The next prime is 21121300043. The reversal of 21121300007 is 70000312112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21121300007 - 2² = 21121300003 is a prime.

It is a super-2 number, since 2×21121300007² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121300003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560650003 + 10560650004.

It is an arithmetic number, because the mean of its divisors is an integer number (10560650004).

Almost surely, 2^21121300007 is an apocalyptic number.

21121300007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121300007 is an equidigital number, since it uses as much as digits as its factorization.

21121300007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

Adding to 21121300007 its reverse (70000312112), we get a palindrome (91121612119).

The spelling of 21121300007 in words is "twenty-one billion, one hundred twenty-one million, three hundred thousand, seven".