821618142 has 16 divisors (see below), whose sum is σ = 1643878800. Its totient is φ = 273765632.

The previous prime is 821618113. The next prime is 821618173. The reversal of 821618142 is 241816128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9267 + ... + 41582.

It is an arithmetic number, because the mean of its divisors is an integer number (102742425).

Almost surely, 2^821618142 is an apocalyptic number.

821618142 is an abundant number, since it is smaller than the sum of its proper divisors (822260658).

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

821618142 is a wasteful number, since it uses less digits than its factorization.

821618142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53547.

The product of its digits is 6144, while the sum is 33.

The square root of 821618142 is about 28663.8821864729. The cubic root of 821618142 is about 936.6054346033.

The spelling of 821618142 in words is "eight hundred twenty-one million, six hundred eighteen thousand, one hundred forty-two".