211621031336 has 128 divisors (see below), whose sum is σ = 475201157760. Its totient is φ = 87086208000.

The previous prime is 211621031309. The next prime is 211621031341. The reversal of 211621031336 is 633130126112.

It is a junction number, because it is equal to n+sod(n) for n = 211621031299 and 211621031308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12354650 + ... + 12371766.

It is an arithmetic number, because the mean of its divisors is an integer number (3712509045).

Almost surely, 2^211621031336 is an apocalyptic number.

211621031336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211621031336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237600578880).

211621031336 is an abundant number, since it is smaller than the sum of its proper divisors (263580126424).

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

211621031336 is a wasteful number, since it uses less digits than its factorization.

211621031336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17355 (or 17351 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

Adding to 211621031336 its reverse (633130126112), we get a palindrome (844751157448).

The spelling of 211621031336 in words is "two hundred eleven billion, six hundred twenty-one million, thirty-one thousand, three hundred thirty-six".