1021221072 has 30 divisors (see below), whose sum is σ = 2858001042. Its totient is φ = 340406976.

The previous prime is 1021221041. The next prime is 1021221073. The reversal of 1021221072 is 2701221201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 841232016 + 179989056 = 29004^2 + 13416^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3545763 + ... + 3546050.

Almost surely, 2^1021221072 is an apocalyptic number.

1021221072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021221072 is an abundant number, since it is smaller than the sum of its proper divisors (1836779970).

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

1021221072 is a wasteful number, since it uses less digits than its factorization.

1021221072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091827 (or 7091818 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1021221072 is about 31956.5497511856. The cubic root of 1021221072 is about 1007.0242352607.

Adding to 1021221072 its reverse (2701221201), we get a palindrome (3722442273).

The spelling of 1021221072 in words is "one billion, twenty-one million, two hundred twenty-one thousand, seventy-two".