21451734 has 24 divisors (see below), whose sum is σ = 46823400. Its totient is φ = 7097568.

The previous prime is 21451723. The next prime is 21451753. The reversal of 21451734 is 43715412.

It is a junction number, because it is equal to n+sod(n) for n = 21451698 and 21451707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1884 + ... + 6815.

It is an arithmetic number, because the mean of its divisors is an integer number (1950975).

Almost surely, 2^21451734 is an apocalyptic number.

21451734 is an abundant number, since it is smaller than the sum of its proper divisors (25371666).

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

21451734 is a wasteful number, since it uses less digits than its factorization.

21451734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8844 (or 8841 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 21451734 is about 4631.6016668103. The cubic root of 21451734 is about 277.8566536660.

The spelling of 21451734 in words is "twenty-one million, four hundred fifty-one thousand, seven hundred thirty-four".