840242196621 has 48 divisors (see below), whose sum is σ = 1278447206400. Its totient is φ = 531041930496.

The previous prime is 840242196613. The next prime is 840242196641. The reversal of 840242196621 is 126691242048.

It is a happy number.

840242196621 is a `hidden beast` number, since 8 + 4 + 0 + 2 + 4 + 2 + 19 + 6 + 621 = 666.

It is not a de Polignac number, because 840242196621 - 2³ = 840242196613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840242196641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4149940 + ... + 4347698.

It is an arithmetic number, because the mean of its divisors is an integer number (26634316800).

Almost surely, 2^840242196621 is an apocalyptic number.

It is an amenable number.

840242196621 is a deficient number, since it is larger than the sum of its proper divisors (438205009779).

840242196621 is a wasteful number, since it uses less digits than its factorization.

840242196621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198090 (or 198087 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 840242196621 in words is "eight hundred forty billion, two hundred forty-two million, one hundred ninety-six thousand, six hundred twenty-one".