121211099965 has 16 divisors (see below), whose sum is σ = 147713397120. Its totient is φ = 95463910080.

The previous prime is 121211099939. The next prime is 121211099983. The reversal of 121211099965 is 569990112121.

It is not a de Polignac number, because 121211099965 - 2¹³ = 121211091773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450720 + ... + 667510.

It is an arithmetic number, because the mean of its divisors is an integer number (9232087320).

Almost surely, 2^121211099965 is an apocalyptic number.

It is an amenable number.

121211099965 is a deficient number, since it is larger than the sum of its proper divisors (26502297155).

121211099965 is a wasteful number, since it uses less digits than its factorization.

121211099965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218532.

The product of its (nonzero) digits is 87480, while the sum is 46.

The spelling of 121211099965 in words is "one hundred twenty-one billion, two hundred eleven million, ninety-nine thousand, nine hundred sixty-five".