21000156463 has 32 divisors (see below), whose sum is σ = 25875666432. Its totient is φ = 16770230400.

The previous prime is 21000156379. The next prime is 21000156503. The reversal of 21000156463 is 36465100012.

It is not a de Polignac number, because 21000156463 - 2¹³ = 21000148271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000151463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 631728 + ... + 664138.

It is an arithmetic number, because the mean of its divisors is an integer number (808614576).

Almost surely, 2^21000156463 is an apocalyptic number.

21000156463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21000156463 is a deficient number, since it is larger than the sum of its proper divisors (4875509969).

21000156463 is a wasteful number, since it uses less digits than its factorization.

21000156463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32655.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21000156463 its reverse (36465100012), we get a palindrome (57465256475).

The spelling of 21000156463 in words is "twenty-one billion, one hundred fifty-six thousand, four hundred sixty-three".