4021021745 has 16 divisors (see below), whose sum is σ = 5208008400. Its totient is φ = 2962735104.

The previous prime is 4021021717. The next prime is 4021021751. The reversal of 4021021745 is 5471201204.

It can be written as a sum of positive squares in 8 ways, for example, as 982697104 + 3038324641 = 31348^2 + 55121^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021021745 - 2⁶ = 4021021681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39704 + ... + 98073.

It is an arithmetic number, because the mean of its divisors is an integer number (325500525).

Almost surely, 2^4021021745 is an apocalyptic number.

It is an amenable number.

4021021745 is a deficient number, since it is larger than the sum of its proper divisors (1186986655).

4021021745 is a wasteful number, since it uses less digits than its factorization.

4021021745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138244.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 4021021745 is about 63411.5269095454. The cubic root of 4021021745 is about 1590.1770229970.

Adding to 4021021745 its reverse (5471201204), we get a palindrome (9492222949).

The spelling of 4021021745 in words is "four billion, twenty-one million, twenty-one thousand, seven hundred forty-five".