21020101002 has 24 divisors (see below), whose sum is σ = 45806816484. Its totient is φ = 6966198144.

The previous prime is 21020100973. The next prime is 21020101073. The reversal of 21020101002 is 20010102012.

It can be written as a sum of positive squares in 2 ways, for example, as 21010792401 + 9308601 = 144951^2 + 3051^2 .

It is a super-2 number, since 2×21020101002² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3371983 + ... + 3378210.

Almost surely, 2^21020101002 is an apocalyptic number.

21020101002 is an abundant number, since it is smaller than the sum of its proper divisors (24786715482).

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

21020101002 is a wasteful number, since it uses less digits than its factorization.

21020101002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6750374 (or 6750371 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21020101002 its reverse (20010102012), we get a palindrome (41030203014).

It can be divided in two parts, 2102010 and 1002, that added together give a palindrome (2103012).

The spelling of 21020101002 in words is "twenty-one billion, twenty million, one hundred one thousand, two".