978486877421 has 16 divisors (see below), whose sum is σ = 1038460953600. Its totient is φ = 918782201088.

The previous prime is 978486877393. The next prime is 978486877499. The reversal of 978486877421 is 124778684879.

It is a cyclic number.

It is not a de Polignac number, because 978486877421 - 2³⁴ = 961307008237 is a prime.

It is a super-2 number, since 2×978486877421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978486876421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40157240 + ... + 40181598.

It is an arithmetic number, because the mean of its divisors is an integer number (64903809600).

Almost surely, 2^978486877421 is an apocalyptic number.

It is an amenable number.

978486877421 is a deficient number, since it is larger than the sum of its proper divisors (59974076179).

978486877421 is a wasteful number, since it uses less digits than its factorization.

978486877421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29788.

The product of its digits is 303464448, while the sum is 71.

The spelling of 978486877421 in words is "nine hundred seventy-eight billion, four hundred eighty-six million, eight hundred seventy-seven thousand, four hundred twenty-one".