402223242340021 has 32 divisors (see below), whose sum is σ = 417768636579840. Its totient is φ = 386844098961600.

The previous prime is 402223242340013. The next prime is 402223242340027. The reversal of 402223242340021 is 120043242322204.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 402223242340021 - 2³ = 402223242340013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402223242340027) 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, 25362451390 + ... + 25362467248.

It is an arithmetic number, because the mean of its divisors is an integer number (13055269893120).

Almost surely, 2^{402223242340021} is an apocalyptic number.

It is an amenable number.

402223242340021 is a deficient number, since it is larger than the sum of its proper divisors (15545394239819).

402223242340021 is a wasteful number, since it uses less digits than its factorization.

402223242340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21457.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 402223242340021 its reverse (120043242322204), we get a palindrome (522266484662225).

The spelling of 402223242340021 in words is "four hundred two trillion, two hundred twenty-three billion, two hundred forty-two million, three hundred forty thousand, twenty-one".