21220210021021 has 8 divisors (see below), whose sum is σ = 23179739637888. Its totient is φ = 19265750340000.

The previous prime is 21220210020991. The next prime is 21220210021063. The reversal of 21220210021021 is 12012001202212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21220210021021 - 2⁹ = 21220210020509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220210020986 and 21220210021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220210022021) 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, 1267475205 + ... + 1267491946.

It is an arithmetic number, because the mean of its divisors is an integer number (2897467454736).

Almost surely, 2^{21220210021021} is an apocalyptic number.

It is an amenable number.

21220210021021 is a deficient number, since it is larger than the sum of its proper divisors (1959529616867).

21220210021021 is a wasteful number, since it uses less digits than its factorization.

21220210021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534967923.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21220210021021 its reverse (12012001202212), we get a palindrome (33232211223233).

The spelling of 21220210021021 in words is "twenty-one trillion, two hundred twenty billion, two hundred ten million, twenty-one thousand, twenty-one".