1021455637802 has 4 divisors (see below), whose sum is σ = 1532183456706. Its totient is φ = 510727818900.

The previous prime is 1021455637747. The next prime is 1021455637849. The reversal of 1021455637802 is 2087365541201.

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., 833220270481 + 188235367321 = 912809^2 + 433861^2 .

It is a super-2 number, since 2×1021455637802² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255363909449 + ... + 255363909452.

Almost surely, 2^{1021455637802} is an apocalyptic number.

1021455637802 is a deficient number, since it is larger than the sum of its proper divisors (510727818904).

1021455637802 is an equidigital number, since it uses as much as digits as its factorization.

1021455637802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510727818903.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 1021455637802 in words is "one trillion, twenty-one billion, four hundred fifty-five million, six hundred thirty-seven thousand, eight hundred two".