21420233103021 has 8 divisors (see below), whose sum is σ = 28560374397120. Its totient is φ = 14280123605472.

The previous prime is 21420233103019. The next prime is 21420233103023. The reversal of 21420233103021 is 12030133202412.

It is an interprime number because it is at equal distance from previous prime (21420233103019) and next prime (21420233103023).

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

It is not a de Polignac number, because 21420233103021 - 2¹ = 21420233103019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21420233102982 and 21420233103000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420233103023) 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, 6330145 + ... + 9105558.

It is an arithmetic number, because the mean of its divisors is an integer number (3570046799640).

Almost surely, 2^{21420233103021} is an apocalyptic number.

It is an amenable number.

21420233103021 is a deficient number, since it is larger than the sum of its proper divisors (7140141294099).

21420233103021 is a wasteful number, since it uses less digits than its factorization.

21420233103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15898275.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21420233103021 its reverse (12030133202412), we get a palindrome (33450366305433).

The spelling of 21420233103021 in words is "twenty-one trillion, four hundred twenty billion, two hundred thirty-three million, one hundred three thousand, twenty-one".