21746612 has 6 divisors (see below), whose sum is σ = 38056578. Its totient is φ = 10873304.

The previous prime is 21746609. The next prime is 21746617. The reversal of 21746612 is 21664712.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 3118756 = 4316^2 + 1766^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21746617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2718323 + ... + 2718330.

It is an arithmetic number, because the mean of its divisors is an integer number (6342763).

Almost surely, 2^21746612 is an apocalyptic number.

It is an amenable number.

21746612 is a deficient number, since it is larger than the sum of its proper divisors (16309966).

21746612 is a wasteful number, since it uses less digits than its factorization.

21746612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5436657 (or 5436655 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 21746612 is about 4663.3262806713. The cubic root of 21746612 is about 279.1240140178.

The spelling of 21746612 in words is "twenty-one million, seven hundred forty-six thousand, six hundred twelve".