22970821 has 8 divisors (see below), whose sum is σ = 23653784. Its totient is φ = 22291200.

The previous prime is 22970809. The next prime is 22970833. The reversal of 22970821 is 12807922.

It is an interprime number because it is at equal distance from previous prime (22970809) and next prime (22970833).

It can be written as a sum of positive squares in 4 ways, for example, as 18369796 + 4601025 = 4286^2 + 2145^2 .

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 22970821 - 2⁷ = 22970693 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 (22970851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21721 + ... + 22753.

It is an arithmetic number, because the mean of its divisors is an integer number (2956723).

Almost surely, 2^22970821 is an apocalyptic number.

It is an amenable number.

22970821 is a deficient number, since it is larger than the sum of its proper divisors (682963).

22970821 is a wasteful number, since it uses less digits than its factorization.

22970821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671.

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

The square root of 22970821 is about 4792.7884368080. The cubic root of 22970821 is about 284.2663844913.

The spelling of 22970821 in words is "twenty-two million, nine hundred seventy thousand, eight hundred twenty-one".