10102021019 has 4 divisors (see below), whose sum is σ = 10104685344. Its totient is φ = 10099356696.

The previous prime is 10102021009. The next prime is 10102021043. The reversal of 10102021019 is 91012020101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91012020101 = 43 ⋅2116558607.

It is a cyclic number.

It is not a de Polignac number, because 10102021019 - 2¹⁶ = 10101955483 is a prime.

It is a super-2 number, since 2×10102021019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10102020988 and 10102021006.

It is not an unprimeable number, because it can be changed into a prime (10102021009) 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, 1326467 + ... + 1334060.

It is an arithmetic number, because the mean of its divisors is an integer number (2526171336).

Almost surely, 2^10102021019 is an apocalyptic number.

10102021019 is a deficient number, since it is larger than the sum of its proper divisors (2664325).

10102021019 is an equidigital number, since it uses as much as digits as its factorization.

10102021019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664324.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 10102021019 in words is "ten billion, one hundred two million, twenty-one thousand, nineteen".