21431203101 has 192 divisors, whose sum is σ = 41258004480. Its totient is φ = 10757577600.

The previous prime is 21431202977. The next prime is 21431203103. The reversal of 21431203101 is 10130213412.

21431203101 is a `hidden beast` number, since 21 + 431 + 203 + 10 + 1 = 666.

It is not a de Polignac number, because 21431203101 - 2¹⁰ = 21431202077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431203103) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 108787735 + ... + 108787931.

It is an arithmetic number, because the mean of its divisors is an integer number (214885440).

Almost surely, 2^21431203101 is an apocalyptic number.

21431203101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21431203101 is a deficient number, since it is larger than the sum of its proper divisors (19826801379).

21431203101 is a wasteful number, since it uses less digits than its factorization.

21431203101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21431203101 its reverse (10130213412), we get a palindrome (31561416513).

The spelling of 21431203101 in words is "twenty-one billion, four hundred thirty-one million, two hundred three thousand, one hundred one".