211401023656 has 16 divisors (see below), whose sum is σ = 396392133600. Its totient is φ = 105696454704.

The previous prime is 211401023591. The next prime is 211401023693. The reversal of 211401023656 is 656320104112.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 279690 + ... + 707833.

It is an arithmetic number, because the mean of its divisors is an integer number (24774508350).

Almost surely, 2^211401023656 is an apocalyptic number.

It is an amenable number.

211401023656 is a deficient number, since it is larger than the sum of its proper divisors (184991109944).

211401023656 is a wasteful number, since it uses less digits than its factorization.

211401023656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014288 (or 1014284 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 211401023656 its reverse (656320104112), we get a palindrome (867721127768).

The spelling of 211401023656 in words is "two hundred eleven billion, four hundred one million, twenty-three thousand, six hundred fifty-six".