21034276499821 has 8 divisors (see below), whose sum is σ = 22652346763424. Its totient is φ = 19416213235440.

The previous prime is 21034276499813. The next prime is 21034276499827. The reversal of 21034276499821 is 12899467243012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21034276499821 - 2³ = 21034276499813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034276499827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5651266 + ... + 8602636.

It is an arithmetic number, because the mean of its divisors is an integer number (2831543345428).

Almost surely, 2^{21034276499821} is an apocalyptic number.

It is an amenable number.

21034276499821 is a deficient number, since it is larger than the sum of its proper divisors (1618070263603).

21034276499821 is a wasteful number, since it uses less digits than its factorization.

21034276499821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499611.

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 21034276499821 in words is "twenty-one trillion, thirty-four billion, two hundred seventy-six million, four hundred ninety-nine thousand, eight hundred twenty-one".