21429802 has 4 divisors (see below), whose sum is σ = 32144706. Its totient is φ = 10714900.

The previous prime is 21429799. The next prime is 21429817. The reversal of 21429802 is 20892412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21058921 + 370881 = 4589^2 + 609^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357449 + ... + 5357452.

Almost surely, 2^21429802 is an apocalyptic number.

21429802 is a deficient number, since it is larger than the sum of its proper divisors (10714904).

21429802 is a wasteful number, since it uses less digits than its factorization.

21429802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10714903.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21429802 is about 4629.2334138602. The cubic root of 21429802 is about 277.7619289209.

The spelling of 21429802 in words is "twenty-one million, four hundred twenty-nine thousand, eight hundred two".