1222121021021 has 8 divisors (see below), whose sum is σ = 1257123586488. Its totient is φ = 1187365824000.

The previous prime is 1222121021003. The next prime is 1222121021027. The reversal of 1222121021021 is 1201201212221.

It can be written as a sum of positive squares in 4 ways, for example, as 12880921 + 1222108140100 = 3589^2 + 1105490^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222121021021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222121021027) 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, 61832090 + ... + 61851851.

It is an arithmetic number, because the mean of its divisors is an integer number (157140448311).

Almost surely, 2^{1222121021021} is an apocalyptic number.

It is an amenable number.

1222121021021 is a deficient number, since it is larger than the sum of its proper divisors (35002565467).

1222121021021 is a wasteful number, since it uses less digits than its factorization.

1222121021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123684223.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1222121021021 its reverse (1201201212221), we get a palindrome (2423322233242).

The spelling of 1222121021021 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, twenty-one".