834212821 has 16 divisors (see below), whose sum is σ = 928657408. Its totient is φ = 744163200.

The previous prime is 834212791. The next prime is 834212839. The reversal of 834212821 is 128212438.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 834212821 - 2⁵ = 834212789 is a prime.

It is a super-2 number, since 2×834212821² = 1391822061441556082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (834210821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531580 + ... + 533146.

It is an arithmetic number, because the mean of its divisors is an integer number (58041088).

Almost surely, 2^834212821 is an apocalyptic number.

It is an amenable number.

834212821 is a deficient number, since it is larger than the sum of its proper divisors (94444587).

834212821 is a wasteful number, since it uses less digits than its factorization.

834212821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932.

The product of its digits is 6144, while the sum is 31.

The square root of 834212821 is about 28882.7426156174. The cubic root of 834212821 is about 941.3669643194.

The spelling of 834212821 in words is "eight hundred thirty-four million, two hundred twelve thousand, eight hundred twenty-one".