21621161033211 has 16 divisors (see below), whose sum is σ = 28974860158464. Its totient is φ = 14340786194784.

The previous prime is 21621161033189. The next prime is 21621161033233. The reversal of 21621161033211 is 11233016112612.

It is an interprime number because it is at equal distance from previous prime (21621161033189) and next prime (21621161033233).

It is not a de Polignac number, because 21621161033211 - 2⁹ = 21621161032699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21621161083211) 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, 92011876 + ... + 92246558.

It is an arithmetic number, because the mean of its divisors is an integer number (1810928759904).

Almost surely, 2^{21621161033211} is an apocalyptic number.

21621161033211 is a deficient number, since it is larger than the sum of its proper divisors (7353699125253).

21621161033211 is a wasteful number, since it uses less digits than its factorization.

21621161033211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390770.

The product of its (nonzero) digits is 2592, while the sum is 30.

Adding to 21621161033211 its reverse (11233016112612), we get a palindrome (32854177145823).

The spelling of 21621161033211 in words is "twenty-one trillion, six hundred twenty-one billion, one hundred sixty-one million, thirty-three thousand, two hundred eleven".