121698810 has 24 divisors (see below), whose sum is σ = 316417140. Its totient is φ = 32452992.

The previous prime is 121698793. The next prime is 121698817. The reversal of 121698810 is 18896121.

It can be written as a sum of positive squares in 2 ways, for example, as 105945849 + 15752961 = 10293^2 + 3969^2 .

It is a super-2 number, since 2×121698810² = 29621200710832200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121698817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 676015 + ... + 676194.

Almost surely, 2^121698810 is an apocalyptic number.

121698810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121698810 is an abundant number, since it is smaller than the sum of its proper divisors (194718330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121698810 is a wasteful number, since it uses less digits than its factorization.

121698810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352222 (or 1352219 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 121698810 is about 11031.7183611621. The cubic root of 121698810 is about 495.5590866878.

The spelling of 121698810 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, eight hundred ten".