211231552642 has 16 divisors (see below), whose sum is σ = 345660436512. Its totient is φ = 96011896320.

The previous prime is 211231552583. The next prime is 211231552663. The reversal of 211231552642 is 246255132112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 211231552598 and 211231552607.

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, 982978 + ... + 1178434.

It is an arithmetic number, because the mean of its divisors is an integer number (21603777282).

Almost surely, 2^211231552642 is an apocalyptic number.

211231552642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211231552642 is a deficient number, since it is larger than the sum of its proper divisors (134428883870).

211231552642 is a wasteful number, since it uses less digits than its factorization.

211231552642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244593.

The product of its digits is 28800, while the sum is 34.

Adding to 211231552642 its reverse (246255132112), we get a palindrome (457486684754).

The spelling of 211231552642 in words is "two hundred eleven billion, two hundred thirty-one million, five hundred fifty-two thousand, six hundred forty-two".