84721021342 has 4 divisors (see below), whose sum is σ = 127081532016. Its totient is φ = 42360510670.

The previous prime is 84721021339. The next prime is 84721021367. The reversal of 84721021342 is 24312012748.

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

It is a junction number, because it is equal to n+sod(n) for n = 84721021298 and 84721021307.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21180255334 + ... + 21180255337.

It is an arithmetic number, because the mean of its divisors is an integer number (31770383004).

Almost surely, 2^84721021342 is an apocalyptic number.

84721021342 is a deficient number, since it is larger than the sum of its proper divisors (42360510674).

84721021342 is a wasteful number, since it uses less digits than its factorization.

84721021342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42360510673.

The product of its (nonzero) digits is 21504, while the sum is 34.

The spelling of 84721021342 in words is "eighty-four billion, seven hundred twenty-one million, twenty-one thousand, three hundred forty-two".