121620132 has 18 divisors (see below), whose sum is σ = 307428758. Its totient is φ = 40540032.

The previous prime is 121620131. The next prime is 121620133. The reversal of 121620132 is 231026121.

121620132 is a `hidden beast` number, since 12 + 1 + 620 + 1 + 32 = 666.

It is an interprime number because it is at equal distance from previous prime (121620131) and next prime (121620133).

It can be written as a sum of positive squares in only one way, i.e., 104530176 + 17089956 = 10224^2 + 4134^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121620131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1689133 + ... + 1689204.

Almost surely, 2^121620132 is an apocalyptic number.

121620132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121620132 is an abundant number, since it is smaller than the sum of its proper divisors (185808626).

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

121620132 is a wasteful number, since it uses less digits than its factorization.

121620132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378347 (or 3378342 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 121620132 is about 11028.1517943851. The cubic root of 121620132 is about 495.4522710636.

Adding to 121620132 its reverse (231026121), we get a palindrome (352646253).

The spelling of 121620132 in words is "one hundred twenty-one million, six hundred twenty thousand, one hundred thirty-two".