1421520121 has 8 divisors (see below), whose sum is σ = 1639499840. Its totient is φ = 1207266768.

The previous prime is 1421520119. The next prime is 1421520151. The reversal of 1421520121 is 1210251241.

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 1421520121 - 2¹ = 1421520119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421520151) 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, 930771 + ... + 932296.

It is an arithmetic number, because the mean of its divisors is an integer number (204937480).

Almost surely, 2^1421520121 is an apocalyptic number.

It is an amenable number.

1421520121 is a deficient number, since it is larger than the sum of its proper divisors (217979719).

1421520121 is a wasteful number, since it uses less digits than its factorization.

1421520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863183.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1421520121 is about 37703.0518791251. The cubic root of 1421520121 is about 1124.3918018886.

Adding to 1421520121 its reverse (1210251241), we get a palindrome (2631771362).

The spelling of 1421520121 in words is "one billion, four hundred twenty-one million, five hundred twenty thousand, one hundred twenty-one".