21000521046 has 16 divisors (see below), whose sum is σ = 42007276224. Its totient is φ = 6999134664.

The previous prime is 21000521011. The next prime is 21000521063. The reversal of 21000521046 is 64012500012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215380 + ... + 297303.

It is an arithmetic number, because the mean of its divisors is an integer number (2625454764).

Almost surely, 2^21000521046 is an apocalyptic number.

21000521046 is an abundant number, since it is smaller than the sum of its proper divisors (21006755178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000521046 is a wasteful number, since it uses less digits than its factorization.

21000521046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519515.

The product of its (nonzero) digits is 480, while the sum is 21.

The spelling of 21000521046 in words is "twenty-one billion, five hundred twenty-one thousand, forty-six".