1026421861 has 4 divisors (see below), whose sum is σ = 1048260672. Its totient is φ = 1004583052.

The previous prime is 1026421849. The next prime is 1026421867. The reversal of 1026421861 is 1681246201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1681246201 = 673 ⋅2498137.

It is a cyclic number.

It is not a de Polignac number, because 1026421861 - 2⁹ = 1026421349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026421867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10919335 + ... + 10919428.

It is an arithmetic number, because the mean of its divisors is an integer number (262065168).

Almost surely, 2^1026421861 is an apocalyptic number.

It is an amenable number.

1026421861 is a deficient number, since it is larger than the sum of its proper divisors (21838811).

1026421861 is an equidigital number, since it uses as much as digits as its factorization.

1026421861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21838810.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1026421861 is about 32037.8192297790. The cubic root of 1026421861 is about 1008.7308376309.

The spelling of 1026421861 in words is "one billion, twenty-six million, four hundred twenty-one thousand, eight hundred sixty-one".