21298602 has 16 divisors (see below), whose sum is σ = 45874080. Its totient is φ = 6553392.

The previous prime is 21298583. The next prime is 21298681. The reversal of 21298602 is 20689212.

It is a self number, because there is not a number n which added to its sum of digits gives 21298602.

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, 136452 + ... + 136607.

It is an arithmetic number, because the mean of its divisors is an integer number (2867130).

Almost surely, 2^21298602 is an apocalyptic number.

21298602 is an abundant number, since it is smaller than the sum of its proper divisors (24575478).

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

21298602 is a wasteful number, since it uses less digits than its factorization.

21298602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273077.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21298602 is about 4615.0408448897. The cubic root of 21298602 is about 277.1939194792.

It can be divided in two parts, 2129 and 8602, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 21298602 in words is "twenty-one million, two hundred ninety-eight thousand, six hundred two".