5401021221 has 32 divisors (see below), whose sum is σ = 8286924800. Its totient is φ = 3473014320.

The previous prime is 5401021211. The next prime is 5401021229. The reversal of 5401021221 is 1221201045.

5401021221 is a `hidden beast` number, since 540 + 1 + 0 + 2 + 122 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-5401021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5401021194 and 5401021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5401021229) 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, 246450 + ... + 267468.

It is an arithmetic number, because the mean of its divisors is an integer number (258966400).

Almost surely, 2^5401021221 is an apocalyptic number.

It is an amenable number.

5401021221 is a deficient number, since it is larger than the sum of its proper divisors (2885903579).

5401021221 is a wasteful number, since it uses less digits than its factorization.

5401021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21366 (or 21360 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 5401021221 is about 73491.6404837992. The cubic root of 5401021221 is about 1754.5212310796.

Adding to 5401021221 its reverse (1221201045), we get a palindrome (6622222266).

The spelling of 5401021221 in words is "five billion, four hundred one million, twenty-one thousand, two hundred twenty-one".