121771361551 has 24 divisors (see below), whose sum is σ = 150002565120. Its totient is φ = 96778040976.

The previous prime is 121771361531. The next prime is 121771361557. The reversal of 121771361551 is 155163177121.

It is a de Polignac number, because none of the positive numbers 2^k-121771361551 is a prime.

It is a super-2 number, since 2×121771361551² (a number of 23 digits) contains 22 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 (121771361557) 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 23 ways as a sum of consecutive naturals, for example, 393871 + ... + 631408.

It is an arithmetic number, because the mean of its divisors is an integer number (6250106880).

Almost surely, 2^121771361551 is an apocalyptic number.

121771361551 is a deficient number, since it is larger than the sum of its proper divisors (28231203569).

121771361551 is a wasteful number, since it uses less digits than its factorization.

121771361551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025371 (or 1025352 counting only the distinct ones).

The product of its digits is 44100, while the sum is 40.

The spelling of 121771361551 in words is "one hundred twenty-one billion, seven hundred seventy-one million, three hundred sixty-one thousand, five hundred fifty-one".