901421521 has 32 divisors (see below), whose sum is σ = 1225728000. Its totient is φ = 640111680.

The previous prime is 901421519. The next prime is 901421557. The reversal of 901421521 is 125124109.

It is a happy number.

It is not a de Polignac number, because 901421521 - 2¹ = 901421519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (901421561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73380 + ... + 84778.

It is an arithmetic number, because the mean of its divisors is an integer number (38304000).

Almost surely, 2^901421521 is an apocalyptic number.

901421521 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

901421521 is a deficient number, since it is larger than the sum of its proper divisors (324306479).

901421521 is a wasteful number, since it uses less digits than its factorization.

901421521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11509.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 901421521 is about 30023.6826688533. The cubic root of 901421521 is about 965.9974370062.

The spelling of 901421521 in words is "nine hundred one million, four hundred twenty-one thousand, five hundred twenty-one".