7457220021 has 8 divisors (see below), whose sum is σ = 10054679040. Its totient is φ = 4915620512.

The previous prime is 7457219999. The next prime is 7457220041. The reversal of 7457220021 is 1200227547.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7457220021 - 2¹¹ = 7457217973 is a prime.

It is a super-2 number, since 2×7457220021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7457220041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13964565 + ... + 13965098.

It is an arithmetic number, because the mean of its divisors is an integer number (1256834880).

Almost surely, 2^7457220021 is an apocalyptic number.

It is an amenable number.

7457220021 is a deficient number, since it is larger than the sum of its proper divisors (2597459019).

7457220021 is a wasteful number, since it uses less digits than its factorization.

7457220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27929755.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 7457220021 is about 86355.1968384069. The cubic root of 7457220021 is about 1953.7049894807.

Adding to 7457220021 its reverse (1200227547), we get a palindrome (8657447568).

The spelling of 7457220021 in words is "seven billion, four hundred fifty-seven million, two hundred twenty thousand, twenty-one".