21545021202422 has 16 divisors (see below), whose sum is σ = 34018724219760. Its totient is φ = 10205455452192.

The previous prime is 21545021202407. The next prime is 21545021202431. The reversal of 21545021202422 is 22420212054512.

It is a super-2 number, since 2×21545021202422² (a number of 27 digits) contains 22 as substring.

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, 2753468 + ... + 7118400.

It is an arithmetic number, because the mean of its divisors is an integer number (2126170263735).

Almost surely, 2^{21545021202422} is an apocalyptic number.

21545021202422 is a deficient number, since it is larger than the sum of its proper divisors (12473703017338).

21545021202422 is a wasteful number, since it uses less digits than its factorization.

21545021202422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4494847.

The product of its (nonzero) digits is 25600, while the sum is 32.

Adding to 21545021202422 its reverse (22420212054512), we get a palindrome (43965233256934).

The spelling of 21545021202422 in words is "twenty-one trillion, five hundred forty-five billion, twenty-one million, two hundred two thousand, four hundred twenty-two".