21003051105451 has 2 divisors, whose sum is σ = 21003051105452. Its totient is φ = 21003051105450.

The previous prime is 21003051105431. The next prime is 21003051105473. The reversal of 21003051105451 is 15450115030012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003051105451 - 2¹⁵ = 21003051072683 is a prime.

It is a super-2 number, since 2×21003051105451² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003051105431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501525552725 + 10501525552726.

It is an arithmetic number, because the mean of its divisors is an integer number (10501525552726).

Almost surely, 2^{21003051105451} is an apocalyptic number.

21003051105451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003051105451 is an equidigital number, since it uses as much as digits as its factorization.

21003051105451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 21003051105451 its reverse (15450115030012), we get a palindrome (36453166135463).

The spelling of 21003051105451 in words is "twenty-one trillion, three billion, fifty-one million, one hundred five thousand, four hundred fifty-one".