1401121921 has 16 divisors (see below), whose sum is σ = 1544155200. Its totient is φ = 1266124608.

The previous prime is 1401121901. The next prime is 1401122057. The reversal of 1401121921 is 1291211041.

It is a cyclic number.

It is not a de Polignac number, because 1401121921 - 2¹¹ = 1401119873 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1401121892 and 1401121901.

It is not an unprimeable number, because it can be changed into a prime (1401121901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30415 + ... + 61051.

It is an arithmetic number, because the mean of its divisors is an integer number (96509700).

Almost surely, 2^1401121921 is an apocalyptic number.

It is an amenable number.

1401121921 is a deficient number, since it is larger than the sum of its proper divisors (143033279).

1401121921 is a wasteful number, since it uses less digits than its factorization.

1401121921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30768.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1401121921 is about 37431.5631653288. The cubic root of 1401121921 is about 1118.9876910108.

Adding to 1401121921 its reverse (1291211041), we get a palindrome (2692332962).

The spelling of 1401121921 in words is "one billion, four hundred one million, one hundred twenty-one thousand, nine hundred twenty-one".