21021011021002 has 4 divisors (see below), whose sum is σ = 31531516531506. Its totient is φ = 10510505510500.

The previous prime is 21021011020993. The next prime is 21021011021057. The reversal of 21021011021002 is 20012011012012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18267067452001 + 2753943569001 = 4273999^2 + 1659501^2 .

It is a super-3 number, since 3×21021011021002³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255252755249 + ... + 5255252755252.

Almost surely, 2^{21021011021002} is an apocalyptic number.

21021011021002 is a deficient number, since it is larger than the sum of its proper divisors (10510505510504).

21021011021002 is a wasteful number, since it uses less digits than its factorization.

21021011021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510505510503.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21021011021002 its reverse (20012011012012), we get a palindrome (41033022033014).

The spelling of 21021011021002 in words is "twenty-one trillion, twenty-one billion, eleven million, twenty-one thousand, two".