1021222212021 has 12 divisors (see below), whose sum is σ = 1609198637280. Its totient is φ = 618922552680.

The previous prime is 1021222211983. The next prime is 1021222212047. The reversal of 1021222212021 is 1202122221201.

It is a happy number.

It is not a de Polignac number, because 1021222212021 - 2¹⁰ = 1021222210997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021222211985 and 1021222212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222211021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5157687841 + ... + 5157688038.

It is an arithmetic number, because the mean of its divisors is an integer number (134099886440).

Almost surely, 2^{1021222212021} is an apocalyptic number.

1021222212021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021222212021 is a deficient number, since it is larger than the sum of its proper divisors (587976425259).

1021222212021 is a wasteful number, since it uses less digits than its factorization.

1021222212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315375896 (or 10315375893 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1021222212021 its reverse (1202122221201), we get a palindrome (2223344433222).

The spelling of 1021222212021 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".