21124202001 has 16 divisors (see below), whose sum is σ = 33227624448. Its totient is φ = 11681586000.

The previous prime is 21124201961. The next prime is 21124202003. The reversal of 21124202001 is 10020242112.

It is not a de Polignac number, because 21124202001 - 2¹⁸ = 21123939857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124202003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16223775 + ... + 16225076.

It is an arithmetic number, because the mean of its divisors is an integer number (2076726528).

Almost surely, 2^21124202001 is an apocalyptic number.

21124202001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21124202001 is a deficient number, since it is larger than the sum of its proper divisors (12103422447).

21124202001 is a wasteful number, since it uses less digits than its factorization.

21124202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32448892.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21124202001 its reverse (10020242112), we get a palindrome (31144444113).

The spelling of 21124202001 in words is "twenty-one billion, one hundred twenty-four million, two hundred two thousand, one".