21003000101021 has 4 divisors (see below), whose sum is σ = 21680516233344. Its totient is φ = 20325483968700.

The previous prime is 21003000100967. The next prime is 21003000101053. The reversal of 21003000101021 is 12010100030012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21003000101021 - 2¹⁰ = 21003000099997 is a prime.

It is a super-2 number, since 2×21003000101021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003000100993 and 21003000101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003000101071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338758066115 + ... + 338758066176.

It is an arithmetic number, because the mean of its divisors is an integer number (5420129058336).

Almost surely, 2^{21003000101021} is an apocalyptic number.

It is an amenable number.

21003000101021 is a deficient number, since it is larger than the sum of its proper divisors (677516132323).

21003000101021 is an equidigital number, since it uses as much as digits as its factorization.

21003000101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677516132322.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21003000101021 its reverse (12010100030012), we get a palindrome (33013100131033).

The spelling of 21003000101021 in words is "twenty-one trillion, three billion, one hundred one thousand, twenty-one".