20521413001 has 4 divisors (see below), whose sum is σ = 20532898512. Its totient is φ = 20509927492.

The previous prime is 20521412993. The next prime is 20521413013. The reversal of 20521413001 is 10031412502.

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 20521413001 - 2³ = 20521412993 is a prime.

It is a super-2 number, since 2×20521413001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20521413001.

It is not an unprimeable number, because it can be changed into a prime (20521413301) 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, 5740075 + ... + 5743648.

It is an arithmetic number, because the mean of its divisors is an integer number (5133224628).

Almost surely, 2^20521413001 is an apocalyptic number.

It is an amenable number.

20521413001 is a deficient number, since it is larger than the sum of its proper divisors (11485511).

20521413001 is a wasteful number, since it uses less digits than its factorization.

20521413001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11485510.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 20521413001 its reverse (10031412502), we get a palindrome (30552825503).

The spelling of 20521413001 in words is "twenty billion, five hundred twenty-one million, four hundred thirteen thousand, one".