21278932101 has 48 divisors (see below), whose sum is σ = 36135159424. Its totient is φ = 11811526272.

The previous prime is 21278932061. The next prime is 21278932111. The reversal of 21278932101 is 10123987212.

It is not a de Polignac number, because 21278932101 - 2¹⁷ = 21278801029 is a prime.

It is a super-3 number, since 3×21278932101³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21278932111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1491735 + ... + 1505931.

Almost surely, 2^21278932101 is an apocalyptic number.

21278932101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21278932101 is a deficient number, since it is larger than the sum of its proper divisors (14856227323).

21278932101 is a wasteful number, since it uses less digits than its factorization.

21278932101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14890 (or 14887 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 21278932101 in words is "twenty-one billion, two hundred seventy-eight million, nine hundred thirty-two thousand, one hundred one".