1221203400104 has 16 divisors (see below), whose sum is σ = 2289784856820. Its totient is φ = 610594104960.

The previous prime is 1221203400041. The next prime is 1221203400121. The reversal of 1221203400104 is 4010043021221.

It can be written as a sum of positive squares in 2 ways, for example, as 1221047100100 + 156300004 = 1105010^2 + 12502^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234359 + ... + 1580294.

Almost surely, 2^{1221203400104} is an apocalyptic number.

It is an amenable number.

1221203400104 is a deficient number, since it is larger than the sum of its proper divisors (1068581456716).

1221203400104 is a wasteful number, since it uses less digits than its factorization.

1221203400104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898780 (or 1898776 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1221203400104 its reverse (4010043021221), we get a palindrome (5231246421325).

The spelling of 1221203400104 in words is "one trillion, two hundred twenty-one billion, two hundred three million, four hundred thousand, one hundred four".