1011055421 has 4 divisors (see below), whose sum is σ = 1043670144. Its totient is φ = 978440700.

The previous prime is 1011055387. The next prime is 1011055427. The reversal of 1011055421 is 1245501101.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011055421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1011055393 and 1011055402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011055427) 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, 16307315 + ... + 16307376.

It is an arithmetic number, because the mean of its divisors is an integer number (260917536).

Almost surely, 2^1011055421 is an apocalyptic number.

It is an amenable number.

1011055421 is a deficient number, since it is larger than the sum of its proper divisors (32614723).

1011055421 is an equidigital number, since it uses as much as digits as its factorization.

1011055421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32614722.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1011055421 is about 31797.0976820212. The cubic root of 1011055421 is about 1003.6716428729.

Adding to 1011055421 its reverse (1245501101), we get a palindrome (2256556522).

The spelling of 1011055421 in words is "one billion, eleven million, fifty-five thousand, four hundred twenty-one".