1020021406 has 4 divisors (see below), whose sum is σ = 1530032112. Its totient is φ = 510010702.

The previous prime is 1020021383. The next prime is 1020021419. The reversal of 1020021406 is 6041200201.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1020021406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255005350 + ... + 255005353.

It is an arithmetic number, because the mean of its divisors is an integer number (382508028).

Almost surely, 2^1020021406 is an apocalyptic number.

1020021406 is a deficient number, since it is larger than the sum of its proper divisors (510010706).

1020021406 is an equidigital number, since it uses as much as digits as its factorization.

1020021406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510010705.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1020021406 is about 31937.7739675138. The cubic root of 1020021406 is about 1006.6297512644.

Adding to 1020021406 its reverse (6041200201), we get a palindrome (7061221607).

The spelling of 1020021406 in words is "one billion, twenty million, twenty-one thousand, four hundred six".