21055242270 has 16 divisors (see below), whose sum is σ = 50532581520. Its totient is φ = 5614731264.

The previous prime is 21055242259. The next prime is 21055242283. The reversal of 21055242270 is 7224255012.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 701841409 = 21055242270 / (2 + 1 + 0 + 5 + 5 + 2 + 4 + 2 + 2 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350920675 + ... + 350920734.

It is an arithmetic number, because the mean of its divisors is an integer number (3158286345).

Almost surely, 2^21055242270 is an apocalyptic number.

21055242270 is an abundant number, since it is smaller than the sum of its proper divisors (29477339250).

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

21055242270 is a wasteful number, since it uses less digits than its factorization.

21055242270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701841419.

The product of its (nonzero) digits is 11200, while the sum is 30.

Adding to 21055242270 its reverse (7224255012), we get a palindrome (28279497282).

The spelling of 21055242270 in words is "twenty-one billion, fifty-five million, two hundred forty-two thousand, two hundred seventy".