1011123421 has 16 divisors (see below), whose sum is σ = 1263899520. Its totient is φ = 785839680.

The previous prime is 1011123403. The next prime is 1011123461. The reversal of 1011123421 is 1243211101.

It is a cyclic number.

It is not a de Polignac number, because 1011123421 - 2⁵ = 1011123389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011123395 and 1011123404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011123461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13075 + ... + 46831.

It is an arithmetic number, because the mean of its divisors is an integer number (78993720).

Almost surely, 2^1011123421 is an apocalyptic number.

1011123421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011123421 is a deficient number, since it is larger than the sum of its proper divisors (252776099).

1011123421 is a wasteful number, since it uses less digits than its factorization.

1011123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34164.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 1011123421 is about 31798.1669440237. The cubic root of 1011123421 is about 1003.6941434995.

Adding to 1011123421 its reverse (1243211101), we get a palindrome (2254334522).

The spelling of 1011123421 in words is "one billion, eleven million, one hundred twenty-three thousand, four hundred twenty-one".