21507006741451 has 32 divisors (see below), whose sum is σ = 27772011417600. Its totient is φ = 16161300247680.

The previous prime is 21507006741433. The next prime is 21507006741487. The reversal of 21507006741451 is 15414760070512.

It is not a de Polignac number, because 21507006741451 - 2¹¹ = 21507006739403 is a prime.

It is a super-2 number, since 2×21507006741451² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21507006741398 and 21507006741407.

It is not an unprimeable number, because it can be changed into a prime (21507006741491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3957915 + ... + 7660228.

It is an arithmetic number, because the mean of its divisors is an integer number (867875356800).

Almost surely, 2^{21507006741451} is an apocalyptic number.

21507006741451 is a deficient number, since it is larger than the sum of its proper divisors (6265004676149).

21507006741451 is a wasteful number, since it uses less digits than its factorization.

21507006741451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11619019.

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 21507006741451 in words is "twenty-one trillion, five hundred seven billion, six million, seven hundred forty-one thousand, four hundred fifty-one".