21153143501 has 16 divisors (see below), whose sum is σ = 24720138240. Its totient is φ = 17723389680.

The previous prime is 21153143491. The next prime is 21153143507. The reversal of 21153143501 is 10534135112.

It is a cyclic number.

It is not a de Polignac number, because 21153143501 - 2⁶ = 21153143437 is a prime.

It is a super-3 number, since 3×21153143501³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153143507) 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, 227180 + ... + 306458.

It is an arithmetic number, because the mean of its divisors is an integer number (1545008640).

Almost surely, 2^21153143501 is an apocalyptic number.

It is an amenable number.

21153143501 is a deficient number, since it is larger than the sum of its proper divisors (3566994739).

21153143501 is an equidigital number, since it uses as much as digits as its factorization.

21153143501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80144.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 21153143501 its reverse (10534135112), we get a palindrome (31687278613).

The spelling of 21153143501 in words is "twenty-one billion, one hundred fifty-three million, one hundred forty-three thousand, five hundred one".