21467642 has 16 divisors (see below), whose sum is σ = 36909312. Its totient is φ = 9173520.

The previous prime is 21467639. The next prime is 21467653. The reversal of 21467642 is 24676412.

It is a junction number, because it is equal to n+sod(n) for n = 21467599 and 21467608.

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, 3167 + ... + 7277.

It is an arithmetic number, because the mean of its divisors is an integer number (2306832).

Almost surely, 2^21467642 is an apocalyptic number.

21467642 is a deficient number, since it is larger than the sum of its proper divisors (15441670).

21467642 is a wasteful number, since it uses less digits than its factorization.

21467642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493.

The product of its digits is 16128, while the sum is 32.

The square root of 21467642 is about 4633.3186810320. The cubic root of 21467642 is about 277.9253202437.

The spelling of 21467642 in words is "twenty-one million, four hundred sixty-seven thousand, six hundred forty-two".