21014542 has 4 divisors (see below), whose sum is σ = 31521816. Its totient is φ = 10507270.

The previous prime is 21014527. The next prime is 21014579. The reversal of 21014542 is 24541012.

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

It is a super-2 number, since 2×21014542² = 883221950939528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253634 + ... + 5253637.

It is an arithmetic number, because the mean of its divisors is an integer number (7880454).

Almost surely, 2^21014542 is an apocalyptic number.

21014542 is a deficient number, since it is larger than the sum of its proper divisors (10507274).

21014542 is a wasteful number, since it uses less digits than its factorization.

21014542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10507273.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21014542 is about 4584.1620826493. The cubic root of 21014542 is about 275.9560859209.

Adding to 21014542 its reverse (24541012), we get a palindrome (45555554).

The spelling of 21014542 in words is "twenty-one million, fourteen thousand, five hundred forty-two".