20521000351 has 4 divisors (see below), whose sum is σ = 20594029104. Its totient is φ = 20447971600.

The previous prime is 20521000337. The next prime is 20521000417. The reversal of 20521000351 is 15300012502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20521000351 - 2⁹ = 20520999839 is a prime.

It is a super-2 number, since 2×20521000351² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20521001351) 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, 36513955 + ... + 36514516.

It is an arithmetic number, because the mean of its divisors is an integer number (5148507276).

Almost surely, 2^20521000351 is an apocalyptic number.

20521000351 is a deficient number, since it is larger than the sum of its proper divisors (73028753).

20521000351 is an equidigital number, since it uses as much as digits as its factorization.

20521000351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73028752.

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 20521000351 its reverse (15300012502), we get a palindrome (35821012853).

The spelling of 20521000351 in words is "twenty billion, five hundred twenty-one million, three hundred fifty-one", and thus it is an aban number.