21153036313021 has 8 divisors (see below), whose sum is σ = 21727267657920. Its totient is φ = 20582545889472.

The previous prime is 21153036312979. The next prime is 21153036313027. The reversal of 21153036313021 is 12031363035112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21153036313021 - 2⁷ = 21153036312893 is a prime.

It is a super-2 number, since 2×21153036313021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153036313027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 935218876 + ... + 935241493.

It is an arithmetic number, because the mean of its divisors is an integer number (2715908457240).

Almost surely, 2^{21153036313021} is an apocalyptic number.

It is an amenable number.

21153036313021 is a deficient number, since it is larger than the sum of its proper divisors (574231344899).

21153036313021 is a wasteful number, since it uses less digits than its factorization.

21153036313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870460675.

The product of its (nonzero) digits is 9720, while the sum is 31.

Adding to 21153036313021 its reverse (12031363035112), we get a palindrome (33184399348133).

The spelling of 21153036313021 in words is "twenty-one trillion, one hundred fifty-three billion, thirty-six million, three hundred thirteen thousand, twenty-one".