840421101690 has 32 divisors (see below), whose sum is σ = 2241122938560. Its totient is φ = 224112293712.

The previous prime is 840421101671. The next prime is 840421101701. The reversal of 840421101690 is 96101124048.

840421101690 is a `hidden beast` number, since 8 + 40 + 421 + 101 + 6 + 90 = 666.

It is a super-2 number, since 2×840421101690² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1556335104 + ... + 1556335643.

It is an arithmetic number, because the mean of its divisors is an integer number (70035091830).

Almost surely, 2^840421101690 is an apocalyptic number.

840421101690 is an abundant number, since it is smaller than the sum of its proper divisors (1400701836870).

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

840421101690 is a wasteful number, since it uses less digits than its factorization.

840421101690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112670763 (or 3112670757 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 840421101690 in words is "eight hundred forty billion, four hundred twenty-one million, one hundred one thousand, six hundred ninety".