21515131442229 has 16 divisors (see below), whose sum is σ = 29394750807744. Its totient is φ = 13989662467200.

The previous prime is 21515131442141. The next prime is 21515131442239. The reversal of 21515131442229 is 92224413151512.

It is a happy number.

It is not a de Polignac number, because 21515131442229 - 2¹³ = 21515131434037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515131442239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24052474 + ... + 24930939.

It is an arithmetic number, because the mean of its divisors is an integer number (1837171925484).

Almost surely, 2^{21515131442229} is an apocalyptic number.

It is an amenable number.

21515131442229 is a deficient number, since it is larger than the sum of its proper divisors (7879619365515).

21515131442229 is a wasteful number, since it uses less digits than its factorization.

21515131442229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48987028.

The product of its digits is 172800, while the sum is 42.

The spelling of 21515131442229 in words is "twenty-one trillion, five hundred fifteen billion, one hundred thirty-one million, four hundred forty-two thousand, two hundred twenty-nine".