1553150021021 has 8 divisors (see below), whose sum is σ = 1558065798144. Its totient is φ = 1548238726720.

The previous prime is 1553150020991. The next prime is 1553150021141. The reversal of 1553150021021 is 1201200513551.

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 1553150021021 - 2³⁰ = 1552076279197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553150021921) 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, 425996 + ... + 1813221.

It is an arithmetic number, because the mean of its divisors is an integer number (194758224768).

Almost surely, 2^{1553150021021} is an apocalyptic number.

It is an amenable number.

1553150021021 is a deficient number, since it is larger than the sum of its proper divisors (4915777123).

1553150021021 is a wasteful number, since it uses less digits than its factorization.

1553150021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2241411.

The product of its (nonzero) digits is 1500, while the sum is 26.

Adding to 1553150021021 its reverse (1201200513551), we get a palindrome (2754350534572).

The spelling of 1553150021021 in words is "one trillion, five hundred fifty-three billion, one hundred fifty million, twenty-one thousand, twenty-one".