121771610631 has 32 divisors (see below), whose sum is σ = 197058892800. Its totient is φ = 73704867840.

The previous prime is 121771610621. The next prime is 121771610659. The reversal of 121771610631 is 136016177121.

It is a happy number.

121771610631 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 7 + 1 + 6 + 10 + 631 = 666.

It is not a de Polignac number, because 121771610631 - 2⁵ = 121771610599 is a prime.

It is a super-2 number, since 2×121771610631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121771610621) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 38191 + ... + 494976.

It is an arithmetic number, because the mean of its divisors is an integer number (6158090400).

Almost surely, 2^121771610631 is an apocalyptic number.

121771610631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121771610631 is a deficient number, since it is larger than the sum of its proper divisors (75287282169).

121771610631 is a wasteful number, since it uses less digits than its factorization.

121771610631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533956 (or 533950 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

Adding to 121771610631 its reverse (136016177121), we get a palindrome (257787787752).

The spelling of 121771610631 in words is "one hundred twenty-one billion, seven hundred seventy-one million, six hundred ten thousand, six hundred thirty-one".