121813810 has 8 divisors (see below), whose sum is σ = 219264876. Its totient is φ = 48725520.

The previous prime is 121813793. The next prime is 121813831. The reversal of 121813810 is 18318121.

It can be written as a sum of positive squares in 2 ways, for example, as 119661721 + 2152089 = 10939^2 + 1467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×121813810² = 29677208613432200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6090681 + ... + 6090700.

Almost surely, 2^121813810 is an apocalyptic number.

121813810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121813810 is a deficient number, since it is larger than the sum of its proper divisors (97451066).

121813810 is a wasteful number, since it uses less digits than its factorization.

121813810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12181388.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 121813810 is about 11036.9293736981. The cubic root of 121813810 is about 495.7151313623.

The spelling of 121813810 in words is "one hundred twenty-one million, eight hundred thirteen thousand, eight hundred ten".