121213863 has 24 divisors (see below), whose sum is σ = 184820480. Its totient is φ = 76340880.

The previous prime is 121213853. The next prime is 121213867. The reversal of 121213863 is 368312121.

It is a happy number.

It is not a de Polignac number, because 121213863 - 2⁴ = 121213847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78408 + ... + 79938.

Almost surely, 2^121213863 is an apocalyptic number.

121213863 is a deficient number, since it is larger than the sum of its proper divisors (63606617).

121213863 is a wasteful number, since it uses less digits than its factorization.

121213863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019 (or 2016 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 121213863 is about 11009.7167538498. The cubic root of 121213863 is about 494.8999736669.

Adding to 121213863 its reverse (368312121), we get a palindrome (489525984).

It can be divided in two parts, 1212138 and 63, that added together give a square (1212201 = 1101²).

The spelling of 121213863 in words is "one hundred twenty-one million, two hundred thirteen thousand, eight hundred sixty-three".