211620051 has 6 divisors (see below), whose sum is σ = 305673420. Its totient is φ = 141080028.

The previous prime is 211620049. The next prime is 211620053. The reversal of 211620051 is 150026112.

It is an interprime number because it is at equal distance from previous prime (211620049) and next prime (211620053).

It is not a de Polignac number, because 211620051 - 2¹ = 211620049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211620053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11756661 + ... + 11756678.

It is an arithmetic number, because the mean of its divisors is an integer number (50945570).

Almost surely, 2^211620051 is an apocalyptic number.

211620051 is a deficient number, since it is larger than the sum of its proper divisors (94053369).

211620051 is a wasteful number, since it uses less digits than its factorization.

211620051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23513345 (or 23513342 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 211620051 is about 14547.1664251152. The cubic root of 211620051 is about 595.9167667126.

Adding to 211620051 its reverse (150026112), we get a palindrome (361646163).

The spelling of 211620051 in words is "two hundred eleven million, six hundred twenty thousand, fifty-one".