21021062 has 4 divisors (see below), whose sum is σ = 31531596. Its totient is φ = 10510530.

The previous prime is 21021053. The next prime is 21021067. The reversal of 21021062 is 26012012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255264 + ... + 5255267.

It is an arithmetic number, because the mean of its divisors is an integer number (7882899).

Almost surely, 2^21021062 is an apocalyptic number.

21021062 is a deficient number, since it is larger than the sum of its proper divisors (10510534).

21021062 is a wasteful number, since it uses less digits than its factorization.

21021062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510533.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21021062 is about 4584.8731716374. The cubic root of 21021062 is about 275.9846224717.

Adding to 21021062 its reverse (26012012), we get a palindrome (47033074).

The spelling of 21021062 in words is "twenty-one million, twenty-one thousand, sixty-two".