1421224521 has 16 divisors (see below), whose sum is σ = 1953999936. Its totient is φ = 918397376.

The previous prime is 1421224447. The next prime is 1421224561. The reversal of 1421224521 is 1254221241.

It is a cyclic number.

It is not a de Polignac number, because 1421224521 - 2¹⁹ = 1420700233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421224491 and 1421224500.

It is not an unprimeable number, because it can be changed into a prime (1421224561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40650 + ... + 67043.

It is an arithmetic number, because the mean of its divisors is an integer number (122124996).

Almost surely, 2^1421224521 is an apocalyptic number.

It is an amenable number.

1421224521 is a deficient number, since it is larger than the sum of its proper divisors (532775415).

1421224521 is a wasteful number, since it uses less digits than its factorization.

1421224521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107832.

The product of its digits is 1280, while the sum is 24.

The square root of 1421224521 is about 37699.1315682470. The cubic root of 1421224521 is about 1124.3138587410.

Adding to 1421224521 its reverse (1254221241), we get a palindrome (2675445762).

The spelling of 1421224521 in words is "one billion, four hundred twenty-one million, two hundred twenty-four thousand, five hundred twenty-one".