30221961 has 32 divisors (see below), whose sum is σ = 51480576. Its totient is φ = 15312000.

The previous prime is 30221959. The next prime is 30221969. The reversal of 30221961 is 16912203.

It is not a de Polignac number, because 30221961 - 2¹ = 30221959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30221969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7876 + ... + 11066.

It is an arithmetic number, because the mean of its divisors is an integer number (1608768).

Almost surely, 2^30221961 is an apocalyptic number.

It is an amenable number.

30221961 is a deficient number, since it is larger than the sum of its proper divisors (21258615).

30221961 is a wasteful number, since it uses less digits than its factorization.

30221961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 30221961 is about 5497.4504090533. The cubic root of 30221961 is about 311.4876844495.

The spelling of 30221961 in words is "thirty million, two hundred twenty-one thousand, nine hundred sixty-one".