21006013214 has 4 divisors (see below), whose sum is σ = 31509019824. Its totient is φ = 10503006606.

The previous prime is 21006013201. The next prime is 21006013241. The reversal of 21006013214 is 41231060012.

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

It is a super-2 number, since 2×21006013214² (a number of 21 digits) 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, 5251503302 + ... + 5251503305.

It is an arithmetic number, because the mean of its divisors is an integer number (7877254956).

Almost surely, 2^21006013214 is an apocalyptic number.

21006013214 is a deficient number, since it is larger than the sum of its proper divisors (10503006610).

21006013214 is a wasteful number, since it uses less digits than its factorization.

21006013214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10503006609.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21006013214 its reverse (41231060012), we get a palindrome (62237073226).

The spelling of 21006013214 in words is "twenty-one billion, six million, thirteen thousand, two hundred fourteen".