1221126040 has 32 divisors (see below), whose sum is σ = 2811433680. Its totient is φ = 477090432.

The previous prime is 1221125909. The next prime is 1221126041. The reversal of 1221126040 is 406211221.

It is a super-2 number, since 2×1221126040² = 2982297611132163200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221125999 and 1221126017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221126041) 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, 353259 + ... + 356698.

Almost surely, 2^1221126040 is an apocalyptic number.

1221126040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221126040 is an abundant number, since it is smaller than the sum of its proper divisors (1590307640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221126040 is a wasteful number, since it uses less digits than its factorization.

1221126040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710011 (or 710007 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1221126040 is about 34944.6138911278. The cubic root of 1221126040 is about 1068.8583741999.

Adding to 1221126040 its reverse (406211221), we get a palindrome (1627337261).

The spelling of 1221126040 in words is "one billion, two hundred twenty-one million, one hundred twenty-six thousand, forty".