21001230153 has 32 divisors (see below), whose sum is σ = 31451068800. Its totient is φ = 13849057728.

The previous prime is 21001230139. The next prime is 21001230227. The reversal of 21001230153 is 35103210012.

It is not a de Polignac number, because 21001230153 - 2⁴ = 21001230137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001220153) 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, 2043175 + ... + 2053427.

It is an arithmetic number, because the mean of its divisors is an integer number (982845900).

Almost surely, 2^21001230153 is an apocalyptic number.

It is an amenable number.

21001230153 is a deficient number, since it is larger than the sum of its proper divisors (10449838647).

21001230153 is a wasteful number, since it uses less digits than its factorization.

21001230153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11078 (or 11072 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21001230153 its reverse (35103210012), we get a palindrome (56104440165).

The spelling of 21001230153 in words is "twenty-one billion, one million, two hundred thirty thousand, one hundred fifty-three".