10021420187 has 2 divisors, whose sum is σ = 10021420188. Its totient is φ = 10021420186.

The previous prime is 10021420181. The next prime is 10021420223. The reversal of 10021420187 is 78102412001.

It is a weak prime.

It is an emirp because it is prime and its reverse (78102412001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10021420187 - 2¹² = 10021416091 is a prime.

It is a super-2 number, since 2×10021420187² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10021420181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010710093 + 5010710094.

It is an arithmetic number, because the mean of its divisors is an integer number (5010710094).

Almost surely, 2^10021420187 is an apocalyptic number.

10021420187 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021420187 is an equidigital number, since it uses as much as digits as its factorization.

10021420187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 10021420187 its reverse (78102412001), we get a palindrome (88123832188).

The spelling of 10021420187 in words is "ten billion, twenty-one million, four hundred twenty thousand, one hundred eighty-seven".