20021200993 has 2 divisors, whose sum is σ = 20021200994. Its totient is φ = 20021200992.

The previous prime is 20021200967. The next prime is 20021201029. The reversal of 20021200993 is 39900212002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12275088849 + 7746112144 = 110793^2 + 88012^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021200993 - 2²⁹ = 19484330081 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021206993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010600496 + 10010600497.

It is an arithmetic number, because the mean of its divisors is an integer number (10010600497).

Almost surely, 2^20021200993 is an apocalyptic number.

It is an amenable number.

20021200993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021200993 is an equidigital number, since it uses as much as digits as its factorization.

20021200993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

Adding to 20021200993 its reverse (39900212002), we get a palindrome (59921412995).

The spelling of 20021200993 in words is "twenty billion, twenty-one million, two hundred thousand, nine hundred ninety-three".