22001961 has 16 divisors (see below), whose sum is σ = 32413824. Its totient is φ = 13204224.

The previous prime is 22001897. The next prime is 22001989. The reversal of 22001961 is 16910022.

It is not a de Polignac number, because 22001961 - 2⁶ = 22001897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22001261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8206 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (2025864).

Almost surely, 2^22001961 is an apocalyptic number.

It is an amenable number.

22001961 is a deficient number, since it is larger than the sum of its proper divisors (10411863).

22001961 is a wasteful number, since it uses less digits than its factorization.

22001961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18800.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 22001961 is about 4690.6247984677. The cubic root of 22001961 is about 280.2122582714.

Adding to 22001961 its reverse (16910022), we get a palindrome (38911983).

The spelling of 22001961 in words is "twenty-two million, one thousand, nine hundred sixty-one".