21202101019 has 4 divisors (see below), whose sum is σ = 23129564760. Its totient is φ = 19274637280.

The previous prime is 21202100929. The next prime is 21202101049. The reversal of 21202101019 is 91010120212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21202101019 - 2²⁵ = 21168546587 is a prime.

It is a super-2 number, since 2×21202101019² (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 = 21202100987 and 21202101005.

It is not an unprimeable number, because it can be changed into a prime (21202101049) 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, 963731854 + ... + 963731875.

It is an arithmetic number, because the mean of its divisors is an integer number (5782391190).

Almost surely, 2^21202101019 is an apocalyptic number.

21202101019 is a deficient number, since it is larger than the sum of its proper divisors (1927463741).

21202101019 is a wasteful number, since it uses less digits than its factorization.

21202101019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927463740.

The product of its (nonzero) digits is 72, while the sum is 19.

It can be divided in two parts, 21202 and 101019, that added together give a palindrome (122221).

The spelling of 21202101019 in words is "twenty-one billion, two hundred two million, one hundred one thousand, nineteen".