1252628016021 has 32 divisors (see below), whose sum is σ = 1867176326400. Its totient is φ = 829943055360.

The previous prime is 1252628016001. The next prime is 1252628016037. The reversal of 1252628016021 is 1206108262521.

1252628016021 is a `hidden beast` number, since 1 + 2 + 5 + 2 + 628 + 0 + 1 + 6 + 0 + 21 = 666.

It is not a de Polignac number, because 1252628016021 - 2⁶ = 1252628015957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252628016001) 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, 30825765 + ... + 30866373.

It is an arithmetic number, because the mean of its divisors is an integer number (58349260200).

Almost surely, 2^{1252628016021} is an apocalyptic number.

It is an amenable number.

1252628016021 is a deficient number, since it is larger than the sum of its proper divisors (614548310379).

1252628016021 is a wasteful number, since it uses less digits than its factorization.

1252628016021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47626 (or 47620 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 1252628016021 in words is "one trillion, two hundred fifty-two billion, six hundred twenty-eight million, sixteen thousand, twenty-one".