21150216301531 has 2 divisors, whose sum is σ = 21150216301532. Its totient is φ = 21150216301530.

The previous prime is 21150216301261. The next prime is 21150216301789. The reversal of 21150216301531 is 13510361205112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21150216301531 - 2⁴¹ = 18951193045979 is a prime.

It is a super-2 number, since 2×21150216301531² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21150216301493 and 21150216301502.

It is not a weakly prime, because it can be changed into another prime (21150216301031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575108150765 + 10575108150766.

It is an arithmetic number, because the mean of its divisors is an integer number (10575108150766).

Almost surely, 2^{21150216301531} is an apocalyptic number.

21150216301531 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150216301531 is an equidigital number, since it uses as much as digits as its factorization.

21150216301531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

Adding to 21150216301531 its reverse (13510361205112), we get a palindrome (34660577506643).

The spelling of 21150216301531 in words is "twenty-one trillion, one hundred fifty billion, two hundred sixteen million, three hundred one thousand, five hundred thirty-one".