1021405212 has 36 divisors (see below), whose sum is σ = 2589577536. Its totient is φ = 339454080.

The previous prime is 1021405199. The next prime is 1021405261. The reversal of 1021405212 is 2125041201.

1021405212 is a `hidden beast` number, since 1 + 0 + 2 + 140 + 521 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29964 + ... + 54227.

Almost surely, 2^1021405212 is an apocalyptic number.

1021405212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021405212 is an abundant number, since it is smaller than the sum of its proper divisors (1568172324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021405212 is a wasteful number, since it uses less digits than its factorization.

1021405212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84538 (or 84533 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1021405212 is about 31959.4307208373. The cubic root of 1021405212 is about 1007.0847583291.

Adding to 1021405212 its reverse (2125041201), we get a palindrome (3146446413).

The spelling of 1021405212 in words is "one billion, twenty-one million, four hundred five thousand, two hundred twelve".