21145425001 has 16 divisors (see below), whose sum is σ = 21839321088. Its totient is φ = 20458224000.

The previous prime is 21145424987. The next prime is 21145425011. The reversal of 21145425001 is 10052454112.

It is a cyclic number.

It is not a de Polignac number, because 21145425001 - 2⁷ = 21145424873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21145425011) 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, 9921706 + ... + 9923836.

It is an arithmetic number, because the mean of its divisors is an integer number (1364957568).

Almost surely, 2^21145425001 is an apocalyptic number.

It is an amenable number.

21145425001 is a deficient number, since it is larger than the sum of its proper divisors (693896087).

21145425001 is a wasteful number, since it uses less digits than its factorization.

21145425001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21145425001 its reverse (10052454112), we get a palindrome (31197879113).

The spelling of 21145425001 in words is "twenty-one billion, one hundred forty-five million, four hundred twenty-five thousand, one".