21545400145151 has 2 divisors, whose sum is σ = 21545400145152. Its totient is φ = 21545400145150.

The previous prime is 21545400145103. The next prime is 21545400145231. The reversal of 21545400145151 is 15154100454512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21545400145151 - 2¹⁴ = 21545400128767 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21545400145651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772700072575 + 10772700072576.

It is an arithmetic number, because the mean of its divisors is an integer number (10772700072576).

Almost surely, 2^{21545400145151} is an apocalyptic number.

21545400145151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21545400145151 is an equidigital number, since it uses as much as digits as its factorization.

21545400145151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80000, while the sum is 38.

Adding to 21545400145151 its reverse (15154100454512), we get a palindrome (36699500599663).

The spelling of 21545400145151 in words is "twenty-one trillion, five hundred forty-five billion, four hundred million, one hundred forty-five thousand, one hundred fifty-one".