1010021398 has 4 divisors (see below), whose sum is σ = 1515032100. Its totient is φ = 505010698.

The previous prime is 1010021393. The next prime is 1010021401. The reversal of 1010021398 is 8931200101.

1010021398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010021393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252505348 + ... + 252505351.

It is an arithmetic number, because the mean of its divisors is an integer number (378758025).

Almost surely, 2^1010021398 is an apocalyptic number.

1010021398 is a deficient number, since it is larger than the sum of its proper divisors (505010702).

1010021398 is an equidigital number, since it uses as much as digits as its factorization.

1010021398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505010701.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1010021398 is about 31780.8338153674. The cubic root of 1010021398 is about 1003.3293690004.

Adding to 1010021398 its reverse (8931200101), we get a palindrome (9941221499).

It can be divided in two parts, 101002 and 1398, that added together give a square (102400 = 320²).

The spelling of 1010021398 in words is "one billion, ten million, twenty-one thousand, three hundred ninety-eight".