121210765 has 32 divisors (see below), whose sum is σ = 169779456. Its totient is φ = 82252800.

The previous prime is 121210729. The next prime is 121210769. The reversal of 121210765 is 567012121.

It is not a de Polignac number, because 121210765 - 2²⁵ = 87656333 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46240 + ... + 48790.

It is an arithmetic number, because the mean of its divisors is an integer number (5305608).

Almost surely, 2^121210765 is an apocalyptic number.

It is an amenable number.

121210765 is a deficient number, since it is larger than the sum of its proper divisors (48568691).

121210765 is a wasteful number, since it uses less digits than its factorization.

121210765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 121210765 is about 11009.5760590497. The cubic root of 121210765 is about 494.8957573912.

Adding to 121210765 its reverse (567012121), we get a palindrome (688222886).

The spelling of 121210765 in words is "one hundred twenty-one million, two hundred ten thousand, seven hundred sixty-five".