21034153402 has 4 divisors (see below), whose sum is σ = 31551230106. Its totient is φ = 10517076700.

The previous prime is 21034153381. The next prime is 21034153403. The reversal of 21034153402 is 20435143012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17894680441 + 3139472961 = 133771^2 + 56031^2 .

It is not an unprimeable number, because it can be changed into a prime (21034153403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5258538349 + ... + 5258538352.

Almost surely, 2^21034153402 is an apocalyptic number.

21034153402 is a deficient number, since it is larger than the sum of its proper divisors (10517076704).

21034153402 is a wasteful number, since it uses less digits than its factorization.

21034153402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10517076703.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21034153402 its reverse (20435143012), we get a palindrome (41469296414).

The spelling of 21034153402 in words is "twenty-one billion, thirty-four million, one hundred fifty-three thousand, four hundred two".