211621001255 has 8 divisors (see below), whose sum is σ = 253988111472. Its totient is φ = 169268194368.

The previous prime is 211621001243. The next prime is 211621001297. The reversal of 211621001255 is 552100126112.

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

It is a cyclic number.

It is not a de Polignac number, because 211621001255 - 2⁶ = 211621001191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3543254 + ... + 3602483.

It is an arithmetic number, because the mean of its divisors is an integer number (31748513934).

Almost surely, 2^211621001255 is an apocalyptic number.

211621001255 is a deficient number, since it is larger than the sum of its proper divisors (42367110217).

211621001255 is an equidigital number, since it uses as much as digits as its factorization.

211621001255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7151665.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 211621001255 its reverse (552100126112), we get a palindrome (763721127367).

The spelling of 211621001255 in words is "two hundred eleven billion, six hundred twenty-one million, one thousand, two hundred fifty-five".