1072770021 has 16 divisors (see below), whose sum is σ = 1589828800. Its totient is φ = 714937104.

The previous prime is 1072770019. The next prime is 1072770073. The reversal of 1072770021 is 1200772701.

It is not a de Polignac number, because 1072770021 - 2¹ = 1072770019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1072770011) 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, 112575 + ... + 121731.

It is an arithmetic number, because the mean of its divisors is an integer number (99364300).

Almost surely, 2^1072770021 is an apocalyptic number.

It is an amenable number.

1072770021 is a deficient number, since it is larger than the sum of its proper divisors (517058779).

1072770021 is an equidigital number, since it uses as much as digits as its factorization.

1072770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13505 (or 13499 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 1072770021 is about 32753.1681063069. The cubic root of 1072770021 is about 1023.6909788996.

The spelling of 1072770021 in words is "one billion, seventy-two million, seven hundred seventy thousand, twenty-one".