1021222210021 has 16 divisors (see below), whose sum is σ = 1126783506240. Its totient is φ = 919526302080.

The previous prime is 1021222210007. The next prime is 1021222210033. The reversal of 1021222210021 is 1200122221201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1021222210021 - 2¹³ = 1021222201829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021222209977 and 1021222210004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222210081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3218650 + ... + 3521668.

It is an arithmetic number, because the mean of its divisors is an integer number (70423969140).

Almost surely, 2^{1021222210021} is an apocalyptic number.

It is an amenable number.

1021222210021 is a deficient number, since it is larger than the sum of its proper divisors (105561296219).

1021222210021 is a wasteful number, since it uses less digits than its factorization.

1021222210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309396.

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

Adding to 1021222210021 its reverse (1200122221201), we get a palindrome (2221344431222).

The spelling of 1021222210021 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred ten thousand, twenty-one".