121567681780 has 12 divisors (see below), whose sum is σ = 255292131780. Its totient is φ = 48627072704.

The previous prime is 121567681771. The next prime is 121567681789. The reversal of 121567681780 is 87186765121.

It is an interprime number because it is at equal distance from previous prime (121567681771) and next prime (121567681789).

It can be written as a sum of positive squares in 2 ways, for example, as 60025980004 + 61541701776 = 245002^2 + 248076^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121567681789) 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, 3039192025 + ... + 3039192064.

It is an arithmetic number, because the mean of its divisors is an integer number (21274344315).

Almost surely, 2^121567681780 is an apocalyptic number.

121567681780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121567681780 is an abundant number, since it is smaller than the sum of its proper divisors (133724450000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121567681780 is a wasteful number, since it uses less digits than its factorization.

121567681780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6078384098 (or 6078384096 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 121567681780 in words is "one hundred twenty-one billion, five hundred sixty-seven million, six hundred eighty-one thousand, seven hundred eighty".