21240929401 has 16 divisors (see below), whose sum is σ = 22532285440. Its totient is φ = 19988130240.

The previous prime is 21240929393. The next prime is 21240929419. The reversal of 21240929401 is 10492904212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21240929401 - 2³ = 21240929393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21240929441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2322700 + ... + 2331826.

It is an arithmetic number, because the mean of its divisors is an integer number (1408267840).

Almost surely, 2^21240929401 is an apocalyptic number.

It is an amenable number.

21240929401 is a deficient number, since it is larger than the sum of its proper divisors (1291356039).

21240929401 is a wasteful number, since it uses less digits than its factorization.

21240929401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21240929401 in words is "twenty-one billion, two hundred forty million, nine hundred twenty-nine thousand, four hundred one".