10101234543421 has 4 divisors (see below), whose sum is σ = 11544268049632. Its totient is φ = 8658201037212.

The previous prime is 10101234543377. The next prime is 10101234543443. The reversal of 10101234543421 is 12434543210101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10101234543421 - 2⁷ = 10101234543293 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 (10101234523421) 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, 721516753095 + ... + 721516753108.

It is an arithmetic number, because the mean of its divisors is an integer number (2886067012408).

Almost surely, 2^{10101234543421} is an apocalyptic number.

It is an amenable number.

10101234543421 is a deficient number, since it is larger than the sum of its proper divisors (1443033506211).

10101234543421 is an equidigital number, since it uses as much as digits as its factorization.

10101234543421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443033506210.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 10101234543421 its reverse (12434543210101), we get a palindrome (22535777753522).

The spelling of 10101234543421 in words is "ten trillion, one hundred one billion, two hundred thirty-four million, five hundred forty-three thousand, four hundred twenty-one".