2161421636246 has 8 divisors (see below), whose sum is σ = 3245252892960. Its totient is φ = 1079670671928.

The previous prime is 2161421636243. The next prime is 2161421636249. The reversal of 2161421636246 is 6426361241612.

It is an interprime number because it is at equal distance from previous prime (2161421636243) and next prime (2161421636249).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2161421636197 and 2161421636206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161421636243) 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, 520070501 + ... + 520074656.

It is an arithmetic number, because the mean of its divisors is an integer number (405656611620).

Almost surely, 2^{2161421636246} is an apocalyptic number.

2161421636246 is a deficient number, since it is larger than the sum of its proper divisors (1083831256714).

2161421636246 is a wasteful number, since it uses less digits than its factorization.

2161421636246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040146198.

The product of its digits is 497664, while the sum is 44.

Adding to 2161421636246 its reverse (6426361241612), we get a palindrome (8587782877858).

The spelling of 2161421636246 in words is "two trillion, one hundred sixty-one billion, four hundred twenty-one million, six hundred thirty-six thousand, two hundred forty-six".