821924141 has 4 divisors (see below), whose sum is σ = 824252892. Its totient is φ = 819595392.

The previous prime is 821924123. The next prime is 821924149. The reversal of 821924141 is 141429128.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123432100 + 698492041 = 11110^2 + 26429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821924141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 821924098 and 821924107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821924149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163846 + ... + 1164551.

It is an arithmetic number, because the mean of its divisors is an integer number (206063223).

Almost surely, 2^821924141 is an apocalyptic number.

It is an amenable number.

821924141 is a deficient number, since it is larger than the sum of its proper divisors (2328751).

821924141 is a wasteful number, since it uses less digits than its factorization.

821924141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328750.

The product of its digits is 4608, while the sum is 32.

The square root of 821924141 is about 28669.2193999069. The cubic root of 821924141 is about 936.7216949191.

The spelling of 821924141 in words is "eight hundred twenty-one million, nine hundred twenty-four thousand, one hundred forty-one".