21150366453551 has 4 divisors (see below), whose sum is σ = 21150382884792. Its totient is φ = 21150350022312.

The previous prime is 21150366453509. The next prime is 21150366453613. The reversal of 21150366453551 is 15535466305112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21150366453551 is a prime.

It is a super-2 number, since 2×21150366453551² (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 = 21150366453496 and 21150366453505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150366423551) 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 3 ways as a sum of consecutive naturals, for example, 6103880 + ... + 8919533.

It is an arithmetic number, because the mean of its divisors is an integer number (5287595721198).

Almost surely, 2^{21150366453551} is an apocalyptic number.

21150366453551 is a deficient number, since it is larger than the sum of its proper divisors (16431241).

21150366453551 is a wasteful number, since it uses less digits than its factorization.

21150366453551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16431240.

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 21150366453551 in words is "twenty-one trillion, one hundred fifty billion, three hundred sixty-six million, four hundred fifty-three thousand, five hundred fifty-one".