21742622 has 16 divisors (see below), whose sum is σ = 35655552. Its totient is φ = 9861720.

The previous prime is 21742619. The next prime is 21742627. The reversal of 21742622 is 22624712.

It is a super-2 number, since 2×21742622² = 945483222869768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21742591 and 21742600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21742627) 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, 14303 + ... + 15749.

It is an arithmetic number, because the mean of its divisors is an integer number (2228472).

Almost surely, 2^21742622 is an apocalyptic number.

21742622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21742622 is a deficient number, since it is larger than the sum of its proper divisors (13912930).

21742622 is a wasteful number, since it uses less digits than its factorization.

21742622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143.

The product of its digits is 2688, while the sum is 26.

The square root of 21742622 is about 4662.8984548240. The cubic root of 21742622 is about 279.1069420414.

The spelling of 21742622 in words is "twenty-one million, seven hundred forty-two thousand, six hundred twenty-two".