21350651 has 4 divisors (see below), whose sum is σ = 24400752. Its totient is φ = 18300552.

The previous prime is 21350633. The next prime is 21350677. The reversal of 21350651 is 15605312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21350651 is a prime.

It is a super-3 number, since 3×21350651³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21350611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1525040 + ... + 1525053.

It is an arithmetic number, because the mean of its divisors is an integer number (6100188).

Almost surely, 2^21350651 is an apocalyptic number.

21350651 is a deficient number, since it is larger than the sum of its proper divisors (3050101).

21350651 is an equidigital number, since it uses as much as digits as its factorization.

21350651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050100.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 21350651 is about 4620.6764656271. The cubic root of 21350651 is about 277.4195356892.

Adding to 21350651 its reverse (15605312), we get a palindrome (36955963).

The spelling of 21350651 in words is "twenty-one million, three hundred fifty thousand, six hundred fifty-one".