1211121401 has 8 divisors (see below), whose sum is σ = 1397843904. Its totient is φ = 1027825200.

The previous prime is 1211121371. The next prime is 1211121469. The reversal of 1211121401 is 1041211121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211121401 - 2¹⁴ = 1211105017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211121491) 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, 855815 + ... + 857228.

It is an arithmetic number, because the mean of its divisors is an integer number (174730488).

Almost surely, 2^1211121401 is an apocalyptic number.

It is an amenable number.

1211121401 is a deficient number, since it is larger than the sum of its proper divisors (186722503).

1211121401 is a wasteful number, since it uses less digits than its factorization.

1211121401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713151.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 1211121401 is about 34801.1695349452. The cubic root of 1211121401 is about 1065.9313272480.

Adding to 1211121401 its reverse (1041211121), we get a palindrome (2252332522).

The spelling of 1211121401 in words is "one billion, two hundred eleven million, one hundred twenty-one thousand, four hundred one".