21151253413013 has 8 divisors (see below), whose sum is σ = 21723548044632. Its totient is φ = 20578992420096.

The previous prime is 21151253412973. The next prime is 21151253413109. The reversal of 21151253413013 is 31031435215112.

It can be written as a sum of positive squares in 4 ways, for example, as 12289778239684 + 8861475173329 = 3505678^2 + 2976823^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21151253413013 - 2²² = 21151249218709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21151253415013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7132520 + ... + 9652737.

It is an arithmetic number, because the mean of its divisors is an integer number (2715443505579).

Almost surely, 2^{21151253413013} is an apocalyptic number.

It is an amenable number.

21151253413013 is a deficient number, since it is larger than the sum of its proper divisors (572294631619).

21151253413013 is a wasteful number, since it uses less digits than its factorization.

21151253413013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16819351.

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 21151253413013 its reverse (31031435215112), we get a palindrome (52182688628125).

The spelling of 21151253413013 in words is "twenty-one trillion, one hundred fifty-one billion, two hundred fifty-three million, four hundred thirteen thousand, thirteen".