121751671651 has 2 divisors, whose sum is σ = 121751671652. Its totient is φ = 121751671650.

The previous prime is 121751671627. The next prime is 121751671693. The reversal of 121751671651 is 156176157121.

It is a weak prime.

It is an emirp because it is prime and its reverse (156176157121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121751671651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121751671598 and 121751671607.

It is not a weakly prime, because it can be changed into another prime (121754671651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60875835825 + 60875835826.

It is an arithmetic number, because the mean of its divisors is an integer number (60875835826).

Almost surely, 2^121751671651 is an apocalyptic number.

121751671651 is a deficient number, since it is larger than the sum of its proper divisors (1).

121751671651 is an equidigital number, since it uses as much as digits as its factorization.

121751671651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 43.

The spelling of 121751671651 in words is "one hundred twenty-one billion, seven hundred fifty-one million, six hundred seventy-one thousand, six hundred fifty-one".