21227400929 has 4 divisors (see below), whose sum is σ = 24259886784. Its totient is φ = 18194915076.

The previous prime is 21227400923. The next prime is 21227400937. The reversal of 21227400929 is 92900472212.

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 21227400929 - 2³² = 16932433633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21227400892 and 21227400901.

It is not an unprimeable number, because it can be changed into a prime (21227400923) 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, 1516242917 + ... + 1516242930.

It is an arithmetic number, because the mean of its divisors is an integer number (6064971696).

Almost surely, 2^21227400929 is an apocalyptic number.

It is an amenable number.

21227400929 is a deficient number, since it is larger than the sum of its proper divisors (3032485855).

21227400929 is an equidigital number, since it uses as much as digits as its factorization.

21227400929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032485854.

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 21227400929 in words is "twenty-one billion, two hundred twenty-seven million, four hundred thousand, nine hundred twenty-nine".