211620623 has 2 divisors, whose sum is σ = 211620624. Its totient is φ = 211620622.

The previous prime is 211620599. The next prime is 211620653. The reversal of 211620623 is 326026112.

211620623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211620623 - 2²² = 207426319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211620653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105810311 + 105810312.

It is an arithmetic number, because the mean of its divisors is an integer number (105810312).

Almost surely, 2^211620623 is an apocalyptic number.

211620623 is a deficient number, since it is larger than the sum of its proper divisors (1).

211620623 is an equidigital number, since it uses as much as digits as its factorization.

211620623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 211620623 is about 14547.1860852881. The cubic root of 211620623 is about 595.9173036246.

Adding to 211620623 its reverse (326026112), we get a palindrome (537646735).

The spelling of 211620623 in words is "two hundred eleven million, six hundred twenty thousand, six hundred twenty-three".