20212001993 has 4 divisors (see below), whose sum is σ = 20219094288. Its totient is φ = 20204909700.

The previous prime is 20212001983. The next prime is 20212002017. The reversal of 20212001993 is 39910021202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20212001993 - 2⁴ = 20212001977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212001903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3541871 + ... + 3547572.

It is an arithmetic number, because the mean of its divisors is an integer number (5054773572).

Almost surely, 2^20212001993 is an apocalyptic number.

It is an amenable number.

20212001993 is a deficient number, since it is larger than the sum of its proper divisors (7092295).

20212001993 is an equidigital number, since it uses as much as digits as its factorization.

20212001993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7092294.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 20212001993 in words is "twenty billion, two hundred twelve million, one thousand, nine hundred ninety-three".