121356451072 has 18 divisors (see below), whose sum is σ = 242238854018. Its totient is φ = 60678225408.

The previous prime is 121356451067. The next prime is 121356451127. The reversal of 121356451072 is 270154653121.

It can be written as a sum of positive squares in only one way, i.e., 105017476096 + 16338974976 = 324064^2 + 127824^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237024063 + ... + 237024574.

Almost surely, 2^121356451072 is an apocalyptic number.

It is an amenable number.

121356451072 is a deficient number, since it is larger than the sum of its proper divisors (120882402946).

121356451072 is an frugal number, since it uses more digits than its factorization.

121356451072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474048653 (or 474048639 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 121356451072 in words is "one hundred twenty-one billion, three hundred fifty-six million, four hundred fifty-one thousand, seventy-two".