21021021012021 has 8 divisors (see below), whose sum is σ = 28190039739360. Its totient is φ = 13933008146352.

The previous prime is 21021021012007. The next prime is 21021021012071. The reversal of 21021021012021 is 12021012012012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21021021012021 - 2¹¹ = 21021021009973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021021012071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20251464811 + ... + 20251465848.

It is an arithmetic number, because the mean of its divisors is an integer number (3523754967420).

Almost surely, 2^{21021021012021} is an apocalyptic number.

It is an amenable number.

21021021012021 is a deficient number, since it is larger than the sum of its proper divisors (7169018727339).

21021021012021 is a wasteful number, since it uses less digits than its factorization.

21021021012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40502930835.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021021012021 its reverse (12021012012012), we get a palindrome (33042033024033).

Subtracting from 21021021012021 its reverse (12021012012012), we obtain a palindrome (9000009000009).

The spelling of 21021021012021 in words is "twenty-one trillion, twenty-one billion, twenty-one million, twelve thousand, twenty-one".