821619142 has 8 divisors (see below), whose sum is σ = 1238814936. Its totient is φ = 408680832.

The previous prime is 821619107. The next prime is 821619157. The reversal of 821619142 is 241916128.

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 = 821619098 and 821619107.

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, 1063888 + ... + 1064659.

It is an arithmetic number, because the mean of its divisors is an integer number (154851867).

Almost surely, 2^821619142 is an apocalyptic number.

821619142 is a deficient number, since it is larger than the sum of its proper divisors (417195794).

821619142 is a wasteful number, since it uses less digits than its factorization.

821619142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128742.

The product of its digits is 6912, while the sum is 34.

The square root of 821619142 is about 28663.8996300224. The cubic root of 821619142 is about 936.6058145872.

The spelling of 821619142 in words is "eight hundred twenty-one million, six hundred nineteen thousand, one hundred forty-two".