420447129021 has 12 divisors (see below), whose sum is σ = 607321686972. Its totient is φ = 280293854976.

The previous prime is 420447129017. The next prime is 420447129029. The reversal of 420447129021 is 120921744024.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 406731440025 + 13715688996 = 637755^2 + 117114^2 .

It is not a de Polignac number, because 420447129021 - 2² = 420447129017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420447129029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 350575 + ... + 981731.

It is an arithmetic number, because the mean of its divisors is an integer number (50610140581).

Almost surely, 2^420447129021 is an apocalyptic number.

It is an amenable number.

420447129021 is a deficient number, since it is larger than the sum of its proper divisors (186874557951).

420447129021 is a wasteful number, since it uses less digits than its factorization.

420447129021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705180 (or 705177 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 420447129021 in words is "four hundred twenty billion, four hundred forty-seven million, one hundred twenty-nine thousand, twenty-one".