1021421421 has 40 divisors (see below), whose sum is σ = 1685876544. Its totient is φ = 613008000.

The previous prime is 1021421419. The next prime is 1021421483. The reversal of 1021421421 is 1241241201.

1021421421 is a `hidden beast` number, since 10 + 214 + 21 + 421 = 666.

It is not a de Polignac number, because 1021421421 - 2¹ = 1021421419 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021421394 and 1021421403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021421411) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 15546 + ... + 47796.

Almost surely, 2^1021421421 is an apocalyptic number.

It is an amenable number.

1021421421 is a deficient number, since it is larger than the sum of its proper divisors (664455123).

1021421421 is a wasteful number, since it uses less digits than its factorization.

1021421421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32303 (or 32294 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1021421421 is about 31959.6843069515. The cubic root of 1021421421 is about 1007.0900855490.

Adding to 1021421421 its reverse (1241241201), we get a palindrome (2262662622).

The spelling of 1021421421 in words is "one billion, twenty-one million, four hundred twenty-one thousand, four hundred twenty-one".