21462661 has 8 divisors (see below), whose sum is σ = 23744448. Its totient is φ = 19236000.

The previous prime is 21462631. The next prime is 21462671. The reversal of 21462661 is 16626412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21462661 - 2⁵ = 21462629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21462631) 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, 12960 + ... + 14521.

It is an arithmetic number, because the mean of its divisors is an integer number (2968056).

Almost surely, 2^21462661 is an apocalyptic number.

It is an amenable number.

21462661 is a deficient number, since it is larger than the sum of its proper divisors (2281787).

21462661 is a wasteful number, since it uses less digits than its factorization.

21462661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27563.

The product of its digits is 3456, while the sum is 28.

The square root of 21462661 is about 4632.7811301636. The cubic root of 21462661 is about 277.9038235014.

The spelling of 21462661 in words is "twenty-one million, four hundred sixty-two thousand, six hundred sixty-one".