20035201021 has 4 divisors (see below), whose sum is σ = 21856582944. Its totient is φ = 18213819100.

The previous prime is 20035201009. The next prime is 20035201037. The reversal of 20035201021 is 12010253002.

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 a de Polignac number, because none of the positive numbers 2^k-20035201021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20035200986 and 20035201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20035201421) 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, 910690945 + ... + 910690966.

It is an arithmetic number, because the mean of its divisors is an integer number (5464145736).

Almost surely, 2^20035201021 is an apocalyptic number.

It is an amenable number.

20035201021 is a deficient number, since it is larger than the sum of its proper divisors (1821381923).

20035201021 is a wasteful number, since it uses less digits than its factorization.

20035201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821381922.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 20035201021 its reverse (12010253002), we get a palindrome (32045454023).

The spelling of 20035201021 in words is "twenty billion, thirty-five million, two hundred one thousand, twenty-one".