82121420478 has 16 divisors (see below), whose sum is σ = 164471281920. Its totient is φ = 27335733336.

The previous prime is 82121420473. The next prime is 82121420501. The reversal of 82121420478 is 87402412128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82121420473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9513700 + ... + 9522327.

It is an arithmetic number, because the mean of its divisors is an integer number (10279455120).

Almost surely, 2^82121420478 is an apocalyptic number.

82121420478 is an abundant number, since it is smaller than the sum of its proper divisors (82349861442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82121420478 is a wasteful number, since it uses less digits than its factorization.

82121420478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19036751.

The product of its (nonzero) digits is 57344, while the sum is 39.

The spelling of 82121420478 in words is "eighty-two billion, one hundred twenty-one million, four hundred twenty thousand, four hundred seventy-eight".