21952070 has 64 divisors (see below), whose sum is σ = 47246976. Its totient is φ = 7188480.

The previous prime is 21952057. The next prime is 21952079. The reversal of 21952070 is 7025912.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 226262 + ... + 226358.

It is an arithmetic number, because the mean of its divisors is an integer number (738234).

Almost surely, 2^21952070 is an apocalyptic number.

21952070 is an abundant number, since it is smaller than the sum of its proper divisors (25294906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21952070 is a wasteful number, since it uses less digits than its factorization.

21952070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21952070 is about 4685.3036187637. The cubic root of 21952070 is about 280.0002976187. Note that the first 3 decimals are identical.

Adding to 21952070 its reverse (7025912), we get a palindrome (28977982).

It can be divided in two parts, 219520 and 70, that multiplied together give a square (15366400 = 3920²).

The spelling of 21952070 in words is "twenty-one million, nine hundred fifty-two thousand, seventy".