21020001002 has 32 divisors (see below), whose sum is σ = 42333992064. Its totient is φ = 7559640000.

The previous prime is 21020000927. The next prime is 21020001071. The reversal of 21020001002 is 20010002012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5247749 + ... + 5251752.

It is an arithmetic number, because the mean of its divisors is an integer number (1322937252).

Almost surely, 2^21020001002 is an apocalyptic number.

21020001002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21020001002 is an abundant number, since it is smaller than the sum of its proper divisors (21313991062).

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

21020001002 is a wasteful number, since it uses less digits than its factorization.

21020001002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10499534.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21020001002 its reverse (20010002012), we get a palindrome (41030003014).

The spelling of 21020001002 in words is "twenty-one billion, twenty million, one thousand, two".