1221210023122 has 4 divisors (see below), whose sum is σ = 1831815034686. Its totient is φ = 610605011560.

The previous prime is 1221210023119. The next prime is 1221210023153. The reversal of 1221210023122 is 2213200121221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1177465882321 + 43744140801 = 1085111^2 + 209151^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221210023122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305302505779 + ... + 305302505782.

Almost surely, 2^{1221210023122} is an apocalyptic number.

1221210023122 is a deficient number, since it is larger than the sum of its proper divisors (610605011564).

1221210023122 is an equidigital number, since it uses as much as digits as its factorization.

1221210023122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610605011563.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1221210023122 its reverse (2213200121221), we get a palindrome (3434410144343).

The spelling of 1221210023122 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, twenty-three thousand, one hundred twenty-two".