21501514131547 has 2 divisors, whose sum is σ = 21501514131548. Its totient is φ = 21501514131546.

The previous prime is 21501514131389. The next prime is 21501514131551. The reversal of 21501514131547 is 74513141510512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21501514131547 is a prime.

It is a super-2 number, since 2×21501514131547² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21501514131577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10750757065773 + 10750757065774.

It is an arithmetic number, because the mean of its divisors is an integer number (10750757065774).

Almost surely, 2^{21501514131547} is an apocalyptic number.

21501514131547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21501514131547 is an equidigital number, since it uses as much as digits as its factorization.

21501514131547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84000, while the sum is 40.

The spelling of 21501514131547 in words is "twenty-one trillion, five hundred one billion, five hundred fourteen million, one hundred thirty-one thousand, five hundred forty-seven".