20521001044 has 6 divisors (see below), whose sum is σ = 35911751834. Its totient is φ = 10260500520.

The previous prime is 20521001029. The next prime is 20521001071. The reversal of 20521001044 is 44010012502.

It can be written as a sum of positive squares in only one way, i.e., 19540684944 + 980316100 = 139788^2 + 31310^2 .

It is a super-2 number, since 2×20521001044² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2565125127 + ... + 2565125134.

Almost surely, 2^20521001044 is an apocalyptic number.

It is an amenable number.

20521001044 is a deficient number, since it is larger than the sum of its proper divisors (15390750790).

20521001044 is a wasteful number, since it uses less digits than its factorization.

20521001044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130250265 (or 5130250263 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 20521001044 its reverse (44010012502), we get a palindrome (64531013546).

The spelling of 20521001044 in words is "twenty billion, five hundred twenty-one million, one thousand, forty-four".