20213233001989 has 2 divisors, whose sum is σ = 20213233001990. Its totient is φ = 20213233001988.

The previous prime is 20213233001977. The next prime is 20213233002133. The reversal of 20213233001989 is 98910033231202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11786793576100 + 8426439425889 = 3433190^2 + 2902833^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213233001989 - 2²⁷ = 20213098784261 is a prime.

It is a super-2 number, since 2×20213233001989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213233011989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106616500994 + 10106616500995.

It is an arithmetic number, because the mean of its divisors is an integer number (10106616500995).

Almost surely, 2^{20213233001989} is an apocalyptic number.

It is an amenable number.

20213233001989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213233001989 is an equidigital number, since it uses as much as digits as its factorization.

20213233001989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 20213233001989 in words is "twenty trillion, two hundred thirteen billion, two hundred thirty-three million, one thousand, nine hundred eighty-nine".