70922821 has 4 divisors (see below), whose sum is σ = 72839692. Its totient is φ = 69005952.

The previous prime is 70922807. The next prime is 70922837. The reversal of 70922821 is 12822907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12822907 = 271 ⋅47317.

It can be written as a sum of positive squares in 2 ways, for example, as 54022500 + 16900321 = 7350^2 + 4111^2 .

It is a cyclic number.

It is not a de Polignac number, because 70922821 - 2¹⁹ = 70398533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70925821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958380 + ... + 958453.

It is an arithmetic number, because the mean of its divisors is an integer number (18209923).

Almost surely, 2^70922821 is an apocalyptic number.

It is an amenable number.

70922821 is a deficient number, since it is larger than the sum of its proper divisors (1916871).

70922821 is a wasteful number, since it uses less digits than its factorization.

70922821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916870.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 70922821 is about 8421.5687968454. The cubic root of 70922821 is about 413.9316810258.

The spelling of 70922821 in words is "seventy million, nine hundred twenty-two thousand, eight hundred twenty-one".