21987951303 has 16 divisors (see below), whose sum is σ = 29485761536. Its totient is φ = 14574617280.

The previous prime is 21987951287. The next prime is 21987951313. The reversal of 21987951303 is 30315978912.

It is not a de Polignac number, because 21987951303 - 2⁴ = 21987951287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21987951313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359658 + ... + 416328.

It is an arithmetic number, because the mean of its divisors is an integer number (1842860096).

Almost surely, 2^21987951303 is an apocalyptic number.

21987951303 is a deficient number, since it is larger than the sum of its proper divisors (7497810233).

21987951303 is a wasteful number, since it uses less digits than its factorization.

21987951303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57414.

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 21987951303 in words is "twenty-one billion, nine hundred eighty-seven million, nine hundred fifty-one thousand, three hundred three".