22001221201937 has 2 divisors, whose sum is σ = 22001221201938. Its totient is φ = 22001221201936.

The previous prime is 22001221201933. The next prime is 22001221202021. The reversal of 22001221201937 is 73910212210022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21981929103121 + 19292098816 = 4688489^2 + 138896^2 .

It is a cyclic number.

It is not a de Polignac number, because 22001221201937 - 2² = 22001221201933 is a prime.

It is not a weakly prime, because it can be changed into another prime (22001221201933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000610600968 + 11000610600969.

It is an arithmetic number, because the mean of its divisors is an integer number (11000610600969).

Almost surely, 2^{22001221201937} is an apocalyptic number.

It is an amenable number.

22001221201937 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001221201937 is an equidigital number, since it uses as much as digits as its factorization.

22001221201937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

Adding to 22001221201937 its reverse (73910212210022), we get a palindrome (95911433411959).

The spelling of 22001221201937 in words is "twenty-two trillion, one billion, two hundred twenty-one million, two hundred one thousand, nine hundred thirty-seven".