21802074147278 has 4 divisors (see below), whose sum is σ = 32703111220920. Its totient is φ = 10901037073638.

The previous prime is 21802074147253. The next prime is 21802074147307. The reversal of 21802074147278 is 87274147020812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5450518536818 + ... + 5450518536821.

It is an arithmetic number, because the mean of its divisors is an integer number (8175777805230).

Almost surely, 2^{21802074147278} is an apocalyptic number.

21802074147278 is a deficient number, since it is larger than the sum of its proper divisors (10901037073642).

21802074147278 is a wasteful number, since it uses less digits than its factorization.

21802074147278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10901037073641.

The product of its (nonzero) digits is 2809856, while the sum is 53.

The spelling of 21802074147278 in words is "twenty-one trillion, eight hundred two billion, seventy-four million, one hundred forty-seven thousand, two hundred seventy-eight".