21025656022 has 16 divisors (see below), whose sum is σ = 36058806432. Its totient is φ = 9007289280.

The previous prime is 21025656013. The next prime is 21025656059. The reversal of 21025656022 is 22065652012.

It is a happy number.

It is a super-2 number, since 2×21025656022² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273453 + ... + 341800.

It is an arithmetic number, because the mean of its divisors is an integer number (2253675402).

Almost surely, 2^21025656022 is an apocalyptic number.

21025656022 is a deficient number, since it is larger than the sum of its proper divisors (15033150410).

21025656022 is a wasteful number, since it uses less digits than its factorization.

21025656022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617703.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21025656022 in words is "twenty-one billion, twenty-five million, six hundred fifty-six thousand, twenty-two".