21014951273 has 4 divisors (see below), whose sum is σ = 22121001360. Its totient is φ = 19908901188.

The previous prime is 21014951261. The next prime is 21014951303. The reversal of 21014951273 is 37215941012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21014951273 - 2⁸ = 21014951017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21014951233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553025015 + ... + 553025052.

It is an arithmetic number, because the mean of its divisors is an integer number (5530250340).

Almost surely, 2^21014951273 is an apocalyptic number.

It is an amenable number.

21014951273 is a deficient number, since it is larger than the sum of its proper divisors (1106050087).

21014951273 is a wasteful number, since it uses less digits than its factorization.

21014951273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106050086.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 21014951273 in words is "twenty-one billion, fourteen million, nine hundred fifty-one thousand, two hundred seventy-three".