21620010 has 32 divisors (see below), whose sum is σ = 52011072. Its totient is φ = 5751680.

The previous prime is 21620003. The next prime is 21620017. The reversal of 21620010 is 1002612.

It is an interprime number because it is at equal distance from previous prime (21620003) and next prime (21620017).

It is not an unprimeable number, because it can be changed into a prime (21620017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22357 + ... + 23303.

It is an arithmetic number, because the mean of its divisors is an integer number (1625346).

Almost surely, 2^21620010 is an apocalyptic number.

21620010 is an abundant number, since it is smaller than the sum of its proper divisors (30391062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21620010 is a wasteful number, since it uses less digits than its factorization.

21620010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21620010 is about 4649.7322503559. The cubic root of 21620010 is about 278.5813018009.

Adding to 21620010 its reverse (1002612), we get a palindrome (22622622).

The spelling of 21620010 in words is "twenty-one million, six hundred twenty thousand, ten".