15151151021 has 2 divisors, whose sum is σ = 15151151022. Its totient is φ = 15151151020.

The previous prime is 15151150999. The next prime is 15151151023. The reversal of 15151151021 is 12015115151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13061289796 + 2089861225 = 114286^2 + 45715^2 .

It is a cyclic number.

It is not a de Polignac number, because 15151151021 - 2¹⁰ = 15151149997 is a prime.

It is a super-2 number, since 2×15151151021² (a number of 21 digits) contains 22 as substring.

Together with 15151151023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15151151023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7575575510 + 7575575511.

It is an arithmetic number, because the mean of its divisors is an integer number (7575575511).

Almost surely, 2^15151151021 is an apocalyptic number.

It is an amenable number.

15151151021 is a deficient number, since it is larger than the sum of its proper divisors (1).

15151151021 is an equidigital number, since it uses as much as digits as its factorization.

15151151021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250, while the sum is 23.

Adding to 15151151021 its reverse (12015115151), we get a palindrome (27166266172).

The spelling of 15151151021 in words is "fifteen billion, one hundred fifty-one million, one hundred fifty-one thousand, twenty-one".