121253665 has 32 divisors (see below), whose sum is σ = 162552096. Its totient is φ = 86261760.

The previous prime is 121253653. The next prime is 121253761. The reversal of 121253665 is 566352121.

It can be written as a sum of positive squares in 16 ways, for example, as 27415696 + 93837969 = 5236^2 + 9687^2 .

It is not a de Polignac number, because 121253665 - 2¹³ = 121245473 is a prime.

It is a super-4 number, since 4×121253665⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209857 + ... + 210433.

It is an arithmetic number, because the mean of its divisors is an integer number (5079753).

Almost surely, 2^121253665 is an apocalyptic number.

It is an amenable number.

121253665 is a deficient number, since it is larger than the sum of its proper divisors (41298431).

121253665 is a wasteful number, since it uses less digits than its factorization.

121253665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709.

The product of its digits is 10800, while the sum is 31.

The square root of 121253665 is about 11011.5241905923. The cubic root of 121253665 is about 494.9541364847.

The spelling of 121253665 in words is "one hundred twenty-one million, two hundred fifty-three thousand, six hundred sixty-five".