1021435421 has 16 divisors (see below), whose sum is σ = 1087042560. Its totient is φ = 959728608.

The previous prime is 1021435417. The next prime is 1021435439. The reversal of 1021435421 is 1245341201.

It is not a de Polignac number, because 1021435421 - 2² = 1021435417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021435411) 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, 939140 + ... + 940226.

It is an arithmetic number, because the mean of its divisors is an integer number (67940160).

Almost surely, 2^1021435421 is an apocalyptic number.

It is an amenable number.

1021435421 is a deficient number, since it is larger than the sum of its proper divisors (65607139).

1021435421 is an equidigital number, since it uses as much as digits as its factorization.

1021435421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1021435421 is about 31959.9033321442. The cubic root of 1021435421 is about 1007.0946867177.

Adding to 1021435421 its reverse (1245341201), we get a palindrome (2266776622).

The spelling of 1021435421 in words is "one billion, twenty-one million, four hundred thirty-five thousand, four hundred twenty-one".