21002178422342 has 8 divisors (see below), whose sum is σ = 33926595913056. Its totient is φ = 9693313117992.

The previous prime is 21002178422327. The next prime is 21002178422507. The reversal of 21002178422342 is 24322487120012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21002178422296 and 21002178422305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403888046558 + ... + 403888046609.

It is an arithmetic number, because the mean of its divisors is an integer number (4240824489132).

Almost surely, 2^{21002178422342} is an apocalyptic number.

21002178422342 is a deficient number, since it is larger than the sum of its proper divisors (12924417490714).

21002178422342 is a wasteful number, since it uses less digits than its factorization.

21002178422342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807776093182.

The product of its (nonzero) digits is 86016, while the sum is 38.

The spelling of 21002178422342 in words is "twenty-one trillion, two billion, one hundred seventy-eight million, four hundred twenty-two thousand, three hundred forty-two".