21502142267 has 2 divisors, whose sum is σ = 21502142268. Its totient is φ = 21502142266.

The previous prime is 21502142261. The next prime is 21502142287. The reversal of 21502142267 is 76224120512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21502142267 - 2⁶ = 21502142203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21502142261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10751071133 + 10751071134.

It is an arithmetic number, because the mean of its divisors is an integer number (10751071134).

Almost surely, 2^21502142267 is an apocalyptic number.

21502142267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21502142267 is an equidigital number, since it uses as much as digits as its factorization.

21502142267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

Adding to 21502142267 its reverse (76224120512), we get a palindrome (97726262779).

The spelling of 21502142267 in words is "twenty-one billion, five hundred two million, one hundred forty-two thousand, two hundred sixty-seven".