121801572 has 18 divisors (see below), whose sum is σ = 307887398. Its totient is φ = 40600512.

The previous prime is 121801553. The next prime is 121801619. The reversal of 121801572 is 275108121.

121801572 is a `hidden beast` number, since 12 + 1 + 80 + 1 + 572 = 666.

It can be written as a sum of positive squares in only one way, i.e., 112656996 + 9144576 = 10614^2 + 3024^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1691653 + ... + 1691724.

Almost surely, 2^121801572 is an apocalyptic number.

121801572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121801572 is an abundant number, since it is smaller than the sum of its proper divisors (186085826).

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

121801572 is a wasteful number, since it uses less digits than its factorization.

121801572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383387 (or 3383382 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 121801572 is about 11036.3749483243. The cubic root of 121801572 is about 495.6985301659.

Adding to 121801572 its reverse (275108121), we get a palindrome (396909693).

The spelling of 121801572 in words is "one hundred twenty-one million, eight hundred one thousand, five hundred seventy-two".