30121761 has 8 divisors (see below), whose sum is σ = 40224384. Its totient is φ = 20050160.

The previous prime is 30121759. The next prime is 30121769. The reversal of 30121761 is 16712103.

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

It is a cyclic number.

It is not a de Polignac number, because 30121761 - 2¹ = 30121759 is a prime.

It is a super-2 number, since 2×30121761² = 1814640971482242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30121769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5385 + ... + 9446.

It is an arithmetic number, because the mean of its divisors is an integer number (5028048).

Almost surely, 2^30121761 is an apocalyptic number.

It is an amenable number.

30121761 is a deficient number, since it is larger than the sum of its proper divisors (10102623).

30121761 is a wasteful number, since it uses less digits than its factorization.

30121761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15511.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 30121761 is about 5488.3295272788. The cubic root of 30121761 is about 311.1430606313.

Adding to 30121761 its reverse (16712103), we get a palindrome (46833864).

The spelling of 30121761 in words is "thirty million, one hundred twenty-one thousand, seven hundred sixty-one".