1020421154 has 4 divisors (see below), whose sum is σ = 1530631734. Its totient is φ = 510210576.

The previous prime is 1020421139. The next prime is 1020421177. The reversal of 1020421154 is 4511240201.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 973128025 + 47293129 = 31195^2 + 6877^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255105287 + ... + 255105290.

Almost surely, 2^1020421154 is an apocalyptic number.

1020421154 is a deficient number, since it is larger than the sum of its proper divisors (510210580).

1020421154 is an equidigital number, since it uses as much as digits as its factorization.

1020421154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510210579.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1020421154 is about 31944.0315865108. The cubic root of 1020421154 is about 1006.7612340195.

Adding to 1020421154 its reverse (4511240201), we get a palindrome (5531661355).

The spelling of 1020421154 in words is "one billion, twenty million, four hundred twenty-one thousand, one hundred fifty-four".