1055240021 has 8 divisors (see below), whose sum is σ = 1162569888. Its totient is φ = 949810000.

The previous prime is 1055240003. The next prime is 1055240027. The reversal of 1055240021 is 1200425501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1055240021 - 2¹⁸ = 1054977877 is a prime.

It is a super-2 number, since 2×1055240021² = 2227063003840160882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1055239975 and 1055240002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055240027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473795 + ... + 476016.

It is an arithmetic number, because the mean of its divisors is an integer number (145321236).

Almost surely, 2^1055240021 is an apocalyptic number.

1055240021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1055240021 is a deficient number, since it is larger than the sum of its proper divisors (107329867).

1055240021 is a wasteful number, since it uses less digits than its factorization.

1055240021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949923.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1055240021 is about 32484.4581453962. The cubic root of 1055240021 is about 1018.0843260353.

Adding to 1055240021 its reverse (1200425501), we get a palindrome (2255665522).

The spelling of 1055240021 in words is "one billion, fifty-five million, two hundred forty thousand, twenty-one".