1122021000 has 96 divisors (see below), whose sum is σ = 3792461400. Its totient is φ = 299203200.

The previous prime is 1122020981. The next prime is 1122021001. The reversal of 1122021000 is 1202211.

It can be written as a sum of positive squares in 4 ways, for example, as 320338404 + 801682596 = 17898^2 + 28314^2 .

It is a super-2 number, since 2×1122021000² = 2517862248882000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1122021001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53335 + ... + 71334.

Almost surely, 2^1122021000 is an apocalyptic number.

1122021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122021000 is an abundant number, since it is smaller than the sum of its proper divisors (2670440400).

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

1122021000 is a wasteful number, since it uses less digits than its factorization.

1122021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124696 (or 124679 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1122021000 is about 33496.5819151746. The cubic root of 1122021000 is about 1039.1230897075.

Adding to 1122021000 its reverse (1202211), we get a palindrome (1123223211).

The spelling of 1122021000 in words is "one billion, one hundred twenty-two million, twenty-one thousand".