2821399951 has 4 divisors (see below), whose sum is σ = 2987364672. Its totient is φ = 2655435232.

The previous prime is 2821399921. The next prime is 2821399963. The reversal of 2821399951 is 1599931282.

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

It is a cyclic number.

It is not a de Polignac number, because 2821399951 - 2¹⁹ = 2820875663 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2821399895 and 2821399904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821399901) 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, 82982335 + ... + 82982368.

It is an arithmetic number, because the mean of its divisors is an integer number (746841168).

Almost surely, 2^2821399951 is an apocalyptic number.

2821399951 is a deficient number, since it is larger than the sum of its proper divisors (165964721).

2821399951 is a wasteful number, since it uses less digits than its factorization.

2821399951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165964720.

The product of its digits is 349920, while the sum is 49.

The square root of 2821399951 is about 53116.8518551316. The cubic root of 2821399951 is about 1413.0413954699.

It can be divided in two parts, 28213 and 99951, that added together give a square (128164 = 358²).

The spelling of 2821399951 in words is "two billion, eight hundred twenty-one million, three hundred ninety-nine thousand, nine hundred fifty-one".