121861864471 has 4 divisors (see below), whose sum is σ = 122094870472. Its totient is φ = 121628858472.

The previous prime is 121861864393. The next prime is 121861864483. The reversal of 121861864471 is 174468168121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121861864471 - 2⁷ = 121861864343 is a prime.

It is a super-3 number, since 3×121861864471³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121861867471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116502216 + ... + 116503261.

It is an arithmetic number, because the mean of its divisors is an integer number (30523717618).

Almost surely, 2^121861864471 is an apocalyptic number.

121861864471 is a deficient number, since it is larger than the sum of its proper divisors (233006001).

121861864471 is an equidigital number, since it uses as much as digits as its factorization.

121861864471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233006000.

The product of its digits is 516096, while the sum is 49.

The spelling of 121861864471 in words is "one hundred twenty-one billion, eight hundred sixty-one million, eight hundred sixty-four thousand, four hundred seventy-one".