121664450 has 24 divisors (see below), whose sum is σ = 226719120. Its totient is φ = 48574800.

The previous prime is 121664447. The next prime is 121664453. The reversal of 121664450 is 54466121.

It is an interprime number because it is at equal distance from previous prime (121664447) and next prime (121664453).

It is not an unprimeable number, because it can be changed into a prime (121664453) 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, 28985 + ... + 32915.

It is an arithmetic number, because the mean of its divisors is an integer number (9446630).

Almost surely, 2^121664450 is an apocalyptic number.

121664450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121664450 is a deficient number, since it is larger than the sum of its proper divisors (105054670).

121664450 is a wasteful number, since it uses less digits than its factorization.

121664450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562 (or 4557 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 121664450 is about 11030.1609235768. The cubic root of 121664450 is about 495.5124441803.

The spelling of 121664450 in words is "one hundred twenty-one million, six hundred sixty-four thousand, four hundred fifty".