21025214 has 16 divisors (see below), whose sum is σ = 36780000. Its totient is φ = 9010512.

The previous prime is 21025211. The next prime is 21025217. The reversal of 21025214 is 41252012.

It is an interprime number because it is at equal distance from previous prime (21025211) and next prime (21025217).

It is a junction number, because it is equal to n+sod(n) for n = 21025192 and 21025201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14639 + ... + 16010.

It is an arithmetic number, because the mean of its divisors is an integer number (2298750).

Almost surely, 2^21025214 is an apocalyptic number.

21025214 is a deficient number, since it is larger than the sum of its proper divisors (15754786).

21025214 is an equidigital number, since it uses as much as digits as its factorization.

21025214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30672 (or 30658 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21025214 is about 4585.3259426130. The cubic root of 21025214 is about 276.0027917522.

Adding to 21025214 its reverse (41252012), we get a palindrome (62277226).

The spelling of 21025214 in words is "twenty-one million, twenty-five thousand, two hundred fourteen".