20521252001 has 16 divisors (see below), whose sum is σ = 21696460800. Its totient is φ = 19380565440.

The previous prime is 20521251953. The next prime is 20521252009. The reversal of 20521252001 is 10025212502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20521252001 - 2⁶ = 20521251937 is a prime.

It is a super-2 number, since 2×20521252001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20521252009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488315 + ... + 528671.

It is an arithmetic number, because the mean of its divisors is an integer number (1356028800).

Almost surely, 2^20521252001 is an apocalyptic number.

It is an amenable number.

20521252001 is a deficient number, since it is larger than the sum of its proper divisors (1175208799).

20521252001 is a wasteful number, since it uses less digits than its factorization.

20521252001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40784.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 20521252001 its reverse (10025212502), we get a palindrome (30546464503).

The spelling of 20521252001 in words is "twenty billion, five hundred twenty-one million, two hundred fifty-two thousand, one".